Packages

 

com.aspose.imaging.fileformats.gif

Class GifImage

  • All Implemented Interfaces:
    IObjectWithBounds, IRasterImageArgb32PixelLoader, IRasterImageRawDataLoader, com.aspose.imaging_internal.IPixelsSaver, com.aspose.imaging_internal.progressmanagement.IProgressEventHandler, com.aspose.imaging_internal.progressmanagement.IProgressInformer, com.aspose.ms.System.IDisposable, Closeable, AutoCloseable


    public final class GifImage
    extends RasterImage

    A gif image.

    Code example:

    This example shows how to create a GIF image and save it to a file.


    String dir = "c:\\temp\\";
    
    // Create a GIF Frame block of 100x100 px.
    com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock firstBlock = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
    try {
        // Fill the entire block in red.
        com.aspose.imaging.Graphics gr = new com.aspose.imaging.Graphics(firstBlock);
        com.aspose.imaging.brushes.SolidBrush brush = new com.aspose.imaging.brushes.SolidBrush(com.aspose.imaging.Color.getRed());
        gr.fillRectangle(brush, firstBlock.getBounds());
    
        com.aspose.imaging.fileformats.gif.GifImage gifImage = new com.aspose.imaging.fileformats.gif.GifImage(firstBlock);
        try {
            gifImage.save(dir + "output.gif");
        } finally {
            gifImage.dispose();
        }
    } finally {
        firstBlock.dispose();
    }
    

    • Constructor Detail

      • GifImage

        public GifImage(GifFrameBlock firstFrame,
                        IColorPalette globalPalette)

        Initializes a new instance of the GifImage class.

        Parameters:
        firstFrame - The first frame to initialize gif image with.
        globalPalette - The global palette to use. Note if both firstFrame and globalPalette are null then default global palette is used.
        Throws:
        com.aspose.ms.System.ArgumentNullException - The frame cannot be null;firstFrame
        com.aspose.ms.System.ArgumentException - The first frame already belongs to some other image. Check the Container property.;firstFrame
        GifImageException - The palette specified should contain entries count equal to power of 2. Minimal palette size is 2, maximal is 256.
        Code example:

        This example shows how to create a GIF image with a custom palette and save it to a file.


        String dir = "c:\\temp\\";
        
        // Create a GIF Frame block of 100x100 px.
        com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock firstBlock = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
        try {
            // Fill the entire block in red.
            com.aspose.imaging.Graphics gr = new com.aspose.imaging.Graphics(firstBlock);
            com.aspose.imaging.brushes.SolidBrush brush = new com.aspose.imaging.brushes.SolidBrush(com.aspose.imaging.Color.getRed());
            gr.fillRectangle(brush, firstBlock.getBounds());
        
            // Use 4-bit palette to reduce the image size. The quality can get worse.
            com.aspose.imaging.IColorPalette palette = com.aspose.imaging.ColorPaletteHelper.create4Bit();
        
            com.aspose.imaging.fileformats.gif.GifImage gifImage = new com.aspose.imaging.fileformats.gif.GifImage(firstBlock, palette);
            try {
                gifImage.save(dir + "output.gif");
            } finally {
                gifImage.dispose();
            }
        } finally {
            firstBlock.dispose();
        }
        

      • GifImage

        public GifImage(GifFrameBlock firstFrame)

        Initializes a new instance of the GifImage class.

        Parameters:
        firstFrame - The first frame to initialize gif image with.
        Throws:
        com.aspose.ms.System.ArgumentNullException - The frame cannot be null;firstFrame
        com.aspose.ms.System.ArgumentException - The first frame already belongs to some other image. Check the Container property.;firstFrame
        GifImageException - The palette specified should contain entries count equal to power of 2. Minimal palette size is 2, maximal is 256.
        Code example:

        The following example shows how to compose an animated GIF image from individual GIF blocks.


        String dir = "c:\\temp\\";
        
        // Create a GIF image 100 x 100 px.
        // The first block is fully black by default.
        com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock firstBlock = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
        com.aspose.imaging.fileformats.gif.GifImage gifImage = new com.aspose.imaging.fileformats.gif.GifImage(firstBlock);
        try {
            // The first circle is red
            com.aspose.imaging.brushes.SolidBrush brush1 = new com.aspose.imaging.brushes.SolidBrush(com.aspose.imaging.Color.getRed());
        
            // The second circle is black
            com.aspose.imaging.brushes.SolidBrush brush2 = new com.aspose.imaging.brushes.SolidBrush(com.aspose.imaging.Color.getBlack());
        
            // Gradually increase the angle of the red arc shape.
            for (int angle = 10; angle <= 360; angle += 10) {
                com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock block = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
        
                com.aspose.imaging.Graphics gr = new com.aspose.imaging.Graphics(block);
                gr.fillPie(brush1, block.getBounds(), 0, angle);
        
                gifImage.addBlock(block);
            }
        
            // Gradually increase the angle of the black arc and wipe out the red arc.
            for (int angle = 10; angle <= 360; angle += 10) {
                com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock block = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
        
                com.aspose.imaging.Graphics gr = new com.aspose.imaging.Graphics(block);
                gr.fillPie(brush2, block.getBounds(), 0, angle);
                gr.fillPie(brush1, block.getBounds(), angle, 360 - angle);
        
                gifImage.addBlock(block);
            }
        
            gifImage.save(dir + "animated_radar.gif");
        } finally {
            firstBlock.dispose();
            gifImage.dispose();
        }
        

      • GifImage

        public GifImage(GifFrameBlock firstFrame,
                        IColorPalette globalPalette,
                        boolean isPaletteSorted,
                        byte paletteColorResolution,
                        byte paletteBackgroundColorIndex,
                        byte aspectRatio,
                        boolean hasTrailer)

        Initializes a new instance of the GifImage class.

        Parameters:
        firstFrame - The first frame to initialize gif image with.
        globalPalette - The global palette to use. Note if both firstFrame and globalPalette are null then default global palette is used.
        isPaletteSorted - if set to true the palette is sorted. Note the parameter is used when globalPalette is not null.
        paletteColorResolution - The palette color resolution. Note the parameter is used when globalPalette is not null.
        paletteBackgroundColorIndex - The palette background color index.
        aspectRatio - The aspect ratio.
        hasTrailer - if set to true the gif image has trailer otherwise no trailer written at the end of the stream.
        Throws:
        com.aspose.ms.System.ArgumentNullException - The frame cannot be null;firstFrame
        com.aspose.ms.System.ArgumentException - The first frame already belongs to some other image. Check the Container property.;firstFrame
        GifImageException - The palette specified should contain entries count equal to power of 2. Minimal palette size is 2, maximal is 256.
    • Method Detail

      • getFileFormat

        public long getFileFormat()

        Gets a value of file format

        Overrides:
        getFileFormat in class Image
      • hasTrailer

        public boolean hasTrailer()

        Gets or sets a value indicating whether GIF has trailer.

        Returns:
        true if GIF has trailer; otherwise, false.
      • setTrailer

        public void setTrailer(boolean value)

        Gets or sets a value indicating whether GIF has trailer.

        Parameters:
        value - true if GIF has trailer; otherwise, false.
      • isPaletteSorted

        public boolean isPaletteSorted()

        Gets or sets a value indicating whether palette is sorted.

        Returns:
        true if palette is sorted; otherwise, false.
      • setPaletteSorted

        public void setPaletteSorted(boolean value)

        Gets or sets a value indicating whether palette is sorted.

        Parameters:
        value - true if palette is sorted; otherwise, false.
      • getPaletteColorResolutionBits

        public byte getPaletteColorResolutionBits()

        Gets or sets the palette color resolution bits.

        Returns:
        The palette color resolution bits.
      • setPaletteColorResolutionBits

        public void setPaletteColorResolutionBits(byte value)

        Sets the palette color resolution bits.

        Parameters:
        value - The palette color resolution bits.
      • getBitsPerPixel

        public int getBitsPerPixel()

        Gets the bits per pixel count.

        Specified by:
        getBitsPerPixel in class Image
        Returns:
        The bits per pixel count.

        For GIF this value is calculated from active frame.

      • getBlocks

        public IGifBlock[] getBlocks()

        Gets the GIF blocks.

      • getActiveFrame

        public GifFrameBlock getActiveFrame()

        Gets or sets the active frame.

        Returns:
        The active frame.
        Code example:

        The following example shows how to remove all blocks from a GIF image.


        com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock firstBlock = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
        com.aspose.imaging.fileformats.gif.GifImage gifImage = new com.aspose.imaging.fileformats.gif.GifImage(firstBlock);
        try {
            if (gifImage.getActiveFrame() != null) {
                System.out.println("Active frame size: " + gifImage.getActiveFrame().getSize());
            } else {
                System.out.println("Active frame is not set");
            }
        
            System.out.println("Clear all the blocks");
            gifImage.clearBlocks();
        
            if (gifImage.getActiveFrame() != null) {
                System.out.println("Active frame size: " + gifImage.getActiveFrame().getSize());
            } else {
                System.out.println("Active frame is not set");
            }
        } finally {
            firstBlock.dispose();
            gifImage.dispose();
        }
        
        // The output looks like this:
        // Active frame size: { Width = 100, Height = 100}
        // Clear all the blocks
        // Active frame is not set
        

      • setActiveFrame

        public void setActiveFrame(GifFrameBlock value)

        Sets the active frame.

        Parameters:
        value - The active frame.
      • getBackgroundColor

        public Color getBackgroundColor()

        Gets the background color.

        Overrides:
        getBackgroundColor in class Image
        Returns:
        The background color.
      • setBackgroundColor

        public void setBackgroundColor(Color value)

        Sets the background color.

        Overrides:
        setBackgroundColor in class Image
        Parameters:
        value - The background color.
      • getBackgroundColorIndex

        public byte getBackgroundColorIndex()

        Gets or sets the background color index.

        Returns:
        The background color index.
      • setBackgroundColorIndex

        public void setBackgroundColorIndex(byte value)

        Sets the background color index.

        Parameters:
        value - The background color index.
      • getPixelAspectRatio

        public byte getPixelAspectRatio()

        Gets the pixel aspect ratio.

        Returns:
        The pixel aspect ratio.
      • setPixelAspectRatio

        public void setPixelAspectRatio(byte value)

        Gets or sets the pixel aspect ratio.

        Parameters:
        value - The pixel aspect ratio.
      • isCached

        public final boolean isCached()

        Gets a value indicating whether object's data is cached currently and no data reading is required.

        Specified by:
        isCached in class DataStreamSupporter
        Returns:
        true if object's data is cached; otherwise, false.
      • hasTransparentColor

        public boolean hasTransparentColor()

        Gets a value indicating whether active frame has transparent color.

        Overrides:
        hasTransparentColor in class RasterImage
      • setTransparentColor

        public void setTransparentColor(boolean value)

        Gets a value indicating whether active frame has transparent color.

        Overrides:
        setTransparentColor in class RasterImage
      • hasBackgroundColor

        public boolean hasBackgroundColor()

        Gets a value indicating whether image has background color.

        Overrides:
        hasBackgroundColor in class Image
      • getImageOpacity

        public float getImageOpacity()

        Gets opacity of this image. 0 = fully transparent, 1 = fully opaque.

        Overrides:
        getImageOpacity in class RasterImage
        Returns:
        The opacity value between 0.0 (fully transparent) and 1.0 (fully opaque).
      • dither

        public void dither(int ditheringMethod,
                           int bitsCount,
                           IColorPalette customPalette)

        Performs dithering on the current image.

        Specified by:
        dither in class RasterImage
        Parameters:
        ditheringMethod - The dithering method.
        bitsCount - The final bits count for dithering.
        customPalette - The custom palette for dithering.
        Code example:

        The following example loads a GIF image and performs threshold and floyd dithering using different palette depth.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Perform threshold dithering using 4-bit color palette which contains 16 colors.
            // The more bits specified the higher quality and the bigger size of the output image.
            // Note that only 1-bit, 4-bit and 8-bit palettes are supported at the moment.
            gifImage.dither(com.aspose.imaging.DitheringMethod.ThresholdDithering, 4, null);
        
            gifImage.save(dir + "sample.ThresholdDithering4.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        
        image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Perform floyd dithering using 1-bit color palette which contains only 2 colors - black and white.
            // The more bits specified the higher quality and the bigger size of the output image.
            // Note that only 1-bit, 4-bit and 8-bit palettes are supported at the moment.
            gifImage.dither(com.aspose.imaging.DitheringMethod.FloydSteinbergDithering, 1, null);
        
            gifImage.save(dir + "sample.FloydSteinbergDithering1.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • cacheData

        public final void cacheData()

        Caches the data and ensures no additional data loading will be performed from the underlying DataStreamSupporter.DataStreamContainer.

        Specified by:
        cacheData in class DataStreamSupporter
      • rotateFlipAll

        public void rotateFlipAll(int rotateFlip)

        Rotates the flip all frames in the image.

        Parameters:
        rotateFlip - The rotate flip type to perform.
      • orderBlocks

        public void orderBlocks()

        Orders the GIF blocks according to the GIF specification. Some GifGraphicsControlBlock may be removed for proper GIF layout.

      • clearBlocks

        public void clearBlocks()

        Clears all the GIF blocks.

        Code example:

        The following example shows how to remove all blocks from a GIF image.


        com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock firstBlock = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
        com.aspose.imaging.fileformats.gif.GifImage gifImage = new com.aspose.imaging.fileformats.gif.GifImage(firstBlock);
        try {
            if (gifImage.getActiveFrame() != null) {
                System.out.println("Active frame size: " + gifImage.getActiveFrame().getSize());
            } else {
                System.out.println("Active frame is not set");
            }
        
            System.out.println("Clear all the blocks");
            gifImage.clearBlocks();
        
            if (gifImage.getActiveFrame() != null) {
                System.out.println("Active frame size: " + gifImage.getActiveFrame().getSize());
            } else {
                System.out.println("Active frame is not set");
            }
        } finally {
            firstBlock.dispose();
            gifImage.dispose();
        }
        
        // The output looks like this:
        // Active frame size: { Width = 100, Height = 100}
        // Clear all the blocks
        // Active frame is not set
        

      • insertBlock

        public void insertBlock(int index,
                                IGifBlock block)

        Adds a new GIF block.

        Parameters:
        index - The zero-based element, at which block will be inserted.
        block - The GIF block to add.
      • addBlock

        public void addBlock(IGifBlock block)

        Adds a new GIF block.

        Parameters:
        block - The GIF block to add.
        Code example:

        The following example shows how to compose an animated GIF image from individual GIF blocks.


        String dir = "c:\\temp\\";
        
        // Create a GIF image 100 x 100 px.
        // The first block is fully black by default.
        com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock firstBlock = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
        com.aspose.imaging.fileformats.gif.GifImage gifImage = new com.aspose.imaging.fileformats.gif.GifImage(firstBlock);
        try {
            // The first circle is red
            com.aspose.imaging.brushes.SolidBrush brush1 = new com.aspose.imaging.brushes.SolidBrush(com.aspose.imaging.Color.getRed());
        
            // The second circle is black
            com.aspose.imaging.brushes.SolidBrush brush2 = new com.aspose.imaging.brushes.SolidBrush(com.aspose.imaging.Color.getBlack());
        
            // Gradually increase the angle of the red arc shape.
            for (int angle = 10; angle <= 360; angle += 10) {
                com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock block = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
        
                com.aspose.imaging.Graphics gr = new com.aspose.imaging.Graphics(block);
                gr.fillPie(brush1, block.getBounds(), 0, angle);
        
                gifImage.addBlock(block);
            }
        
            // Gradually increase the angle of the black arc and wipe out the red arc.
            for (int angle = 10; angle <= 360; angle += 10) {
                com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock block = new com.aspose.imaging.fileformats.gif.blocks.GifFrameBlock(100, 100);
        
                com.aspose.imaging.Graphics gr = new com.aspose.imaging.Graphics(block);
                gr.fillPie(brush2, block.getBounds(), 0, angle);
                gr.fillPie(brush1, block.getBounds(), angle, 360 - angle);
        
                gifImage.addBlock(block);
            }
        
            gifImage.save(dir + "animated_radar.gif");
        } finally {
            firstBlock.dispose();
            gifImage.dispose();
        }
        

      • removeBlock

        public void removeBlock(IGifBlock block)

        Removes the GIF block.

        Parameters:
        block - The block to remove.

        Note: do not forget to Dispose the block if you will not add it to some other GifImage.

      • rotateFlip

        public void rotateFlip(int rotateFlipType)

        Rotates, flips, or rotates and flips the image.

        Specified by:
        rotateFlip in class Image
        Parameters:
        rotateFlipType - The rotate flip type.
        Code example:

        This example loads a GIF image, rotates it by 90 degrees clockwise and optionally flips the image horizontally and(or) vertically.


        
        // The helper class used in the main example below.
        class Utils {
            // The helper method to get a string representation of the file format.
            public String getRotateFlipTypeString(int rotateFlipType) {
                if (rotateFlipType == com.aspose.imaging.RotateFlipType.RotateNoneFlipNone) {
                    return "RotateNoneFlipNone";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate90FlipNone) {
                    return "Rotate90FlipNone";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate180FlipNone) {
                    return "Rotate180FlipNone";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate270FlipNone) {
                    return "Rotate270FlipNone";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.RotateNoneFlipX) {
                    return "RotateNoneFlipX";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate90FlipX) {
                    return "Rotate90FlipX";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate180FlipX) {
                    return "Rotate180FlipX";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate270FlipX) {
                    return "Rotate270FlipX";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.RotateNoneFlipY) {
                    return "RotateNoneFlipY";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate90FlipY) {
                    return "Rotate90FlipY";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate180FlipY) {
                    return "Rotate180FlipY";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate270FlipY) {
                    return "Rotate270FlipY";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.RotateNoneFlipXY) {
                    return "RotateNoneFlipXY";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate90FlipXY) {
                    return "Rotate90FlipXY";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate180FlipXY) {
                    return "Rotate180FlipXY";
                } else if (rotateFlipType == com.aspose.imaging.RotateFlipType.Rotate270FlipXY) {
                    return "Rotate270FlipXY";
                } else {
                    return "UNDEFINED";
                }
            }
        }
        
        // Here is the main example
        Utils utils = new Utils();
        
        String dir = "c:\\temp\\";
        
        int[] rotateFlipTypes = new int[]
                {
                        com.aspose.imaging.RotateFlipType.Rotate90FlipNone,
                        com.aspose.imaging.RotateFlipType.Rotate90FlipX,
                        com.aspose.imaging.RotateFlipType.Rotate90FlipXY,
                        com.aspose.imaging.RotateFlipType.Rotate90FlipY,
                };
        
        for (int rotateFlipType : rotateFlipTypes) {
            // Rotate, flip and save to the output file.
            com.aspose.imaging.fileformats.gif.GifImage image = (com.aspose.imaging.fileformats.gif.GifImage) com.aspose.imaging.Image.load(dir + "sample.gif");
            try {
                image.rotateFlip(rotateFlipType);
                image.save(dir + "sample." + utils.getRotateFlipTypeString(rotateFlipType) + ".png", new com.aspose.imaging.imageoptions.PngOptions());
            } finally {
                image.dispose();
            }
        }
        

      • rotate

        public void rotate(float angle,
                           boolean resizeProportionally,
                           Color backgroundColor)

        Rotate image around the center.

        Overrides:
        rotate in class RasterImage
        Parameters:
        angle - The rotate angle in degrees. Positive values will rotate clockwise.
        resizeProportionally - if set to true you will have your image size changed according to rotated rectangle (corner points) projections in other case that leaves dimensions untouched and only internal image contents are rotated.
        backgroundColor - Color of the background.
      • normalizeAngle

        public void normalizeAngle(boolean resizeProportionally,
                                   Color backgroundColor)

        Normalizes the angle. This method is applicable to scanned text documents to get rid of the skewed scan. This method uses RasterImage.getSkewAngle() and RasterImage.rotate(float,boolean,Color) methods.

        Overrides:
        normalizeAngle in class RasterImage
        Parameters:
        resizeProportionally - if set to true you will have your image size changed according to rotated rectangle (corner points) projections in other case that leaves dimensions untouched and only internal image contents are rotated.
        backgroundColor - Color of the background.
      • resize

        public void resize(int newWidth,
                           int newHeight,
                           int resizeType)

        Resizes the image.

        Overrides:
        resize in class RasterImage
        Parameters:
        newWidth - The new width.
        newHeight - The new height.
        resizeType - The resize type.
        Code example:

        This example loads a GIF image and resizes it using various resizing methods.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.fileformats.gif.GifImage image = (com.aspose.imaging.fileformats.gif.GifImage) com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            // Scale up by 2 times using Nearest Neighbour resampling.
            image.resize(image.getWidth() * 2, image.getHeight() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);
            image.save(dir + "upsample.nearestneighbour.gif");
        } finally {
            image.dispose();
        }
        
        image = (com.aspose.imaging.fileformats.gif.GifImage) com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            // Scale down by 2 times using Nearest Neighbour resampling.
            image.resize(image.getWidth() / 2, image.getHeight() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);
            image.save(dir + "downsample.nearestneighbour.gif");
        } finally {
            image.dispose();
        }
        
        image = (com.aspose.imaging.fileformats.gif.GifImage) com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            // Scale up by 2 times using Bilinear resampling.
            image.resize(image.getWidth() * 2, image.getHeight() * 2, com.aspose.imaging.ResizeType.BilinearResample);
            image.save(dir + "upsample.bilinear.gif");
        } finally {
            image.dispose();
        }
        
        image = (com.aspose.imaging.fileformats.gif.GifImage) com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            // Scale down by 2 times using Bilinear resampling.
            image.resize(image.getWidth() / 2, image.getHeight() / 2, com.aspose.imaging.ResizeType.BilinearResample);
            image.save(dir + "downsample.bilinear.gif");
        } finally {
            image.dispose();
        }
        

      • resize

        public void resize(int newWidth,
                           int newHeight,
                           ImageResizeSettings settings)

        Resizes the image with extended options.

        Overrides:
        resize in class RasterImage
        Parameters:
        newWidth - The new width.
        newHeight - The new height.
        settings - The resize settings.
        Throws:
        com.aspose.ms.System.ArgumentOutOfRangeException - newWidth;The new width should be positive number and at least 1. or newHeight;The new height should be positive number and at least 1.
        Code example:

        This example loads a GIF image and resizes it using various resizing settings.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.ImageResizeSettings resizeSettings = new com.aspose.imaging.ImageResizeSettings();
        
        // The adaptive algorithm based on weighted and blended rational function and lanczos3 interpolation.
        resizeSettings.setMode(com.aspose.imaging.ResizeType.AdaptiveResample);
        
        // The small rectangular filter
        resizeSettings.setFilterType(com.aspose.imaging.ImageFilterType.SmallRectangular);
        
        // The number of colors in the palette.
        resizeSettings.setEntriesCount(256);
        
        // The color quantization is not used
        resizeSettings.setColorQuantizationMethod(com.aspose.imaging.ColorQuantizationMethod.None);
        
        // The Euclidian method
        resizeSettings.setColorCompareMethod(com.aspose.imaging.ColorCompareMethod.Euclidian);
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Scale down by 2 times using adaptive resampling.
            gifImage.resize(image.getWidth() / 2, image.getHeight() / 2, resizeSettings);
        
            // Save to PNG
            gifImage.save(dir + "downsample.adaptive.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • resizeProportional

        public void resizeProportional(int newWidth,
                                       int newHeight,
                                       int resizeType)

        Performs proportional resize on the image. The proportional resize will resize each frame according to the ratio of newWidth/width and newHeight/height.

        Parameters:
        newWidth - The new width.
        newHeight - The new height.
        resizeType - The resize type.
      • crop

        public void crop(Rectangle rectangle)

        Cropping the image.

        Overrides:
        crop in class RasterImage
        Parameters:
        rectangle - The rectangle.
        Code example:

        The following example crops a GIF image. The cropping area is be specified via Aspose.Imaging.Rectangle.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Crop the image. The cropping area is the rectangular central area of the image.
            com.aspose.imaging.Rectangle area = new com.aspose.imaging.Rectangle(
                    gifImage.getWidth() / 4,
                    gifImage.getHeight() / 4,
                    gifImage.getWidth() / 2,
                    gifImage.getHeight() / 2);
            gifImage.crop(area);
        
            // Save the cropped image to PNG
            gifImage.save(dir + "sample.Crop.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • grayscale

        public void grayscale()

        Transformation of an image to its grayscale representation

        Overrides:
        grayscale in class RasterImage
        Code example:

        The following example transforms a colored GIF image to its grayscale representation. Grayscale images are composed exclusively of shades of gray and carry only intensity information.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            gifImage.grayscale();
            gifImage.save(dir + "sample.Grayscale.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • binarizeFixed

        public void binarizeFixed(byte threshold)

        Binarization of an image with predefined threshold

        Overrides:
        binarizeFixed in class RasterImage
        Parameters:
        threshold - Threshold value. If corresponding gray value of a pixel is greater than threshold, a value of 255 will be assigned to it, 0 otherwise.
        Code example:

        The following example binarizes a GIF image with the predefined threshold. Binarized images contain only 2 colors - black and white.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage djvuImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Binarize the image with a threshold value of 127.
            // If a corresponding gray value of a pixel is greater than 127, a value of 255 will be assigned to it, 0 otherwise.
            djvuImage.binarizeFixed((byte) 127);
            djvuImage.save(dir + "sample.BinarizeFixed.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • binarizeOtsu

        public void binarizeOtsu()

        Binarization of an image with Otsu thresholding

        Overrides:
        binarizeOtsu in class RasterImage
        Code example:

        The following example binarizes a GIF image with Otsu thresholding. Binarized images contain only 2 colors - black and white.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Binarize the image with Otsu thresholding.
            gifImage.binarizeOtsu();
            gifImage.save(dir + "sample.BinarizeOtsu.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • binarizeBradley

        public void binarizeBradley(double brightnessDifference)

        Binarization of an image using Bradley's adaptive thresholding algorithm using the integral image thresholding

        Overrides:
        binarizeBradley in class RasterImage
        Parameters:
        brightnessDifference - The brightness difference between pixel and the average of an s x s window of pixels centered around this pixel.
      • adjustBrightness

        public void adjustBrightness(int brightness)

        Adjust of a brightness for image.

        Overrides:
        adjustBrightness in class RasterImage
        Parameters:
        brightness - Brightness value.
        Code example:

        The following example performs brightness correction of a GIF image.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Set the brightness value. The accepted values of brightness are in the range [-255, 255].
            gifImage.adjustBrightness(50);
            gifImage.save(dir + "sample.AdjustBrightness.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • adjustContrast

        public void adjustContrast(float contrast)

        Image contrasting

        Overrides:
        adjustContrast in class RasterImage
        Parameters:
        contrast - Contrast value (in range [-100; 100])
        Code example:

        The following example performs contrast correction of a GIF image.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Set the contrast value. The accepted values of contrast are in the range [-100f, 100f].
            gifImage.adjustContrast(50f);
            gifImage.save(dir + "sample.AdjustContrast.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • adjustGamma

        public void adjustGamma(float gammaRed,
                                float gammaGreen,
                                float gammaBlue)

        Gamma-correction of an image.

        Overrides:
        adjustGamma in class RasterImage
        Parameters:
        gammaRed - Gamma for red channel coefficient
        gammaGreen - Gamma for green channel coefficient
        gammaBlue - Gamma for blue channel coefficient
        Code example:

        The following example performs gamma-correction of a GIF image applying different coefficients for color components.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Set individual gamma coefficients for red, green and blue channels.
            gifImage.adjustGamma(1.5f, 2.5f, 3.5f);
            gifImage.save(dir + "sample.AdjustGamma.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • adjustGamma

        public void adjustGamma(float gamma)

        Gamma-correction of an image.

        Overrides:
        adjustGamma in class RasterImage
        Parameters:
        gamma - Gamma for red, green and blue channels coefficient
        Code example:

        The following example performs gamma-correction of a GIF image.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Set gamma coefficient for red, green and blue channels.
            gifImage.adjustGamma(2.5f);
            gifImage.save(dir + "sample.AdjustGamma.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • filter

        public void filter(Rectangle rectangle,
                           FilterOptionsBase options)

        Filters the specified rectangle.

        Overrides:
        filter in class RasterImage
        Parameters:
        rectangle - The rectangle.
        options - The options.
        Code example:

        The following example applies various types of filters to a GIF image.


        String dir = "c:\\temp\\";
        
        com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Apply a median filter with a rectangle size of 5 to the entire image.
            gifImage.filter(gifImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.MedianFilterOptions(5));
            gifImage.save(dir + "sample.MedianFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        
        image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Apply a bilateral smoothing filter with a kernel size of 5 to the entire image.
            gifImage.filter(gifImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.BilateralSmoothingFilterOptions(5));
            gifImage.save(dir + "sample.BilateralSmoothingFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        
        image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Apply a Gaussian blur filter with a radius of 5 and a sigma value of 4.0 to the entire image.
            gifImage.filter(gifImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.GaussianBlurFilterOptions(5, 4.0));
            gifImage.save(dir + "sample.GaussianBlurFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        
        image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Apply a Gauss-Wiener filter with a radius of 5 and a smooth value of 4.0 to the entire image.
            gifImage.filter(gifImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.GaussWienerFilterOptions(5, 4.0));
            gifImage.save(dir + "sample.GaussWienerFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        
        image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Apply a motion wiener filter with a length of 5, a smooth value of 4.0 and an angle of 90.0 degrees to the entire image.
            gifImage.filter(gifImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.MotionWienerFilterOptions(10, 1.0, 90.0));
            gifImage.save(dir + "sample.MotionWienerFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        
        image = com.aspose.imaging.Image.load(dir + "sample.gif");
        try {
            com.aspose.imaging.fileformats.gif.GifImage gifImage = (com.aspose.imaging.fileformats.gif.GifImage) image;
        
            // Apply a sharpen filter with a kernel size of 5 and a sigma value of 4.0 to the entire image.
            gifImage.filter(gifImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.SharpenFilterOptions(5, 4.0));
            gifImage.save(dir + "sample.SharpenFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
        } finally {
            image.dispose();
        }
        

      • replaceColor

        public void replaceColor(int oldColorArgb,
                                 byte oldColorDiff,
                                 int newColorArgb)

        Replaces one color to another with allowed difference and preserves original alpha value to save smooth edges.

        Overrides:
        replaceColor in class RasterImage
        Parameters:
        oldColorArgb - Old color ARGB value to be replaced.
        oldColorDiff - Allowed difference in old color to be able to widen replaced color tone.
        newColorArgb - New color ARGB value to replace old color with.
      • replaceNonTransparentColors

        public void replaceNonTransparentColors(int newColorArgb)

        Replaces all non-transparent colors with new color and preserves original alpha value to save smooth edges. Note: if you use it on images without transparency, all colors will be replaced with a single one.

        Overrides:
        replaceNonTransparentColors in class RasterImage
        Parameters:
        newColorArgb - New color ARGB value to replace non transparent colors with.