DjvuImage

String dir = "c:\\temp\\";

// Load a DJVU image from a file stream.
java.io.InputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
try {
    // Save each page as an individual PNG image.
    for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
        // Generate a file name based on the page number.
        String fileName = String.format("sample.%s.png", djvuPage.getPageNumber());
        djvuPage.save(dir + fileName, new com.aspose.imaging.imageoptions.PngOptions());
    }
} finally {
    djvuImage.dispose();
    stream.close();
}

String dir = "c:\\temp\\";

// Load a DJVU image from a file stream.
java.io.InputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
try {
    // Save each page as an individual PNG image.
    for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
        // Generate a file name based on the page number.
        String fileName = String.format("sample.%s.png", djvuPage.getPageNumber());
        djvuPage.save(dir + fileName, new com.aspose.imaging.imageoptions.PngOptions());
    }
} finally {
    djvuImage.dispose();
    stream.close();
}

String dir = "c:\\temp\\";

// Load a DJVU image from a file stream.
java.io.FileInputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
    try {
        System.out.println("The total number of pages: " + djvuImage.getPages().length);
        System.out.println("The active page number:    " + djvuImage.getActivePage().getPageNumber());
        System.out.println("The first page number:     " + djvuImage.getFirstPage().getPageNumber());
        System.out.println("The last page number:      " + djvuImage.getLastPage().getPageNumber());

        for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
            System.out.println("--------------------------------------------------");
            System.out.println("Page number:     " + djvuPage.getPageNumber());
            System.out.println("Page size:       " + djvuPage.getSize());
            System.out.println("Page raw format: " + djvuPage.getRawDataFormat());
        }
    } finally {
        djvuImage.dispose();
    }
} finally {
    stream.close();
}

//The output may look like this:
//The total number of pages: 2
//The active page number:    1
//The first page number:     1
//The last page number:      2
//--------------------------------------------------
//Page number:     1
//Page size:       { Width = 2481, Height = 3508}
//Page raw format: RgbIndexed1Bpp, used channels: 1
//--------------------------------------------------
//Page number:     2
//Page size:       { Width = 2481, Height = 3508}
//Page raw format: RgbIndexed1Bpp, used channels: 1

String dir = "c:\\temp\\";

// Load a DJVU image from a file stream.
java.io.FileInputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
    try {
        System.out.println("The total number of pages: " + djvuImage.getPages().length);
        System.out.println("The active page number:    " + djvuImage.getActivePage().getPageNumber());
        System.out.println("The first page number:     " + djvuImage.getFirstPage().getPageNumber());
        System.out.println("The last page number:      " + djvuImage.getLastPage().getPageNumber());

        for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
            System.out.println("--------------------------------------------------");
            System.out.println("Page number:     " + djvuPage.getPageNumber());
            System.out.println("Page size:       " + djvuPage.getSize());
            System.out.println("Page raw format: " + djvuPage.getRawDataFormat());
        }
    } finally {
        djvuImage.dispose();
    }
} finally {
    stream.close();
}

//The output may look like this:
//The total number of pages: 2
//The active page number:    1
//The first page number:     1
//The last page number:      2
//--------------------------------------------------
//Page number:     1
//Page size:       { Width = 2481, Height = 3508}
//Page raw format: RgbIndexed1Bpp, used channels: 1
//--------------------------------------------------
//Page number:     2
//Page size:       { Width = 2481, Height = 3508}
//Page raw format: RgbIndexed1Bpp, used channels: 1

String dir = "c:\\temp\\";

// Load a DJVU image from a file stream.
java.io.FileInputStream stream = new java.io.FileInputStream(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = new com.aspose.imaging.fileformats.djvu.DjvuImage(stream);
    try {
        System.out.println("The total number of pages: " + djvuImage.getPages().length);
        System.out.println("The active page number:    " + djvuImage.getActivePage().getPageNumber());
        System.out.println("The first page number:     " + djvuImage.getFirstPage().getPageNumber());
        System.out.println("The last page number:      " + djvuImage.getLastPage().getPageNumber());

        for (com.aspose.imaging.fileformats.djvu.DjvuPage djvuPage : djvuImage.getPages()) {
            System.out.println("--------------------------------------------------");
            System.out.println("Page number:     " + djvuPage.getPageNumber());
            System.out.println("Page size:       " + djvuPage.getSize());
            System.out.println("Page raw format: " + djvuPage.getRawDataFormat());
        }
    } finally {
        djvuImage.dispose();
    }
} finally {
    stream.close();
}

//The output may look like this:
//The total number of pages: 2
//The active page number:    1
//The first page number:     1
//The last page number:      2
//--------------------------------------------------
//Page number:     1
//Page size:       { Width = 2481, Height = 3508}
//Page raw format: RgbIndexed1Bpp, used channels: 1
//--------------------------------------------------
//Page number:     2
//Page size:       { Width = 2481, Height = 3508}
//Page raw format: RgbIndexed1Bpp, used channels: 1

String dir = "c:\\temp\\";

com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale up by 2 times using Nearest Neighbour resampling.
    image.resize(image.getWidth() * 2, image.getHeight() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);

    // Save to PNG with default options.
    image.save(dir + "upsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale down by 2 times using Nearest Neighbour resampling.
    image.resize(image.getWidth() / 2, image.getHeight() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);

    // Save to PNG with default options.
    image.save(dir + "downsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale up by 2 times using Bilinear resampling.
    image.resize(image.getWidth() * 2, image.getHeight() * 2, com.aspose.imaging.ResizeType.BilinearResample);

    // Save to PNG with default options.
    image.save(dir + "upsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale down by 2 times using Bilinear resampling.
    image.resize(image.getWidth() / 2, image.getHeight() / 2, com.aspose.imaging.ResizeType.BilinearResample);

    // Save to PNG with default options.
    image.save(dir + "downsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale up by 2 times using Nearest Neighbour resampling.
    image.resizeWidthProportionally(image.getWidth() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);

    // Save to PNG with the default options.
    image.save(dir + "upsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale down by 2 times using Nearest Neighbour resampling.
    image.resizeWidthProportionally(image.getWidth() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);

    // Save to PNG with the default options.
    image.save(dir + "downsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale up by 2 times using Bilinear resampling.
    image.resizeWidthProportionally(image.getWidth() * 2, com.aspose.imaging.ResizeType.BilinearResample);

    // Save to PNG with the default options.
    image.save(dir + "upsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale down by 2 times using Bilinear resampling.
    image.resizeWidthProportionally(image.getWidth() / 2, com.aspose.imaging.ResizeType.BilinearResample);

    // Save to PNG with the default options.
    image.save(dir + "downsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale up by 2 times using Nearest Neighbour resampling.
    image.resizeHeightProportionally(image.getHeight() * 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);

    // Save to PNG with the default options.
    image.save(dir + "upsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale down by 2 times using Nearest Neighbour resampling.
    image.resizeHeightProportionally(image.getHeight() / 2, com.aspose.imaging.ResizeType.NearestNeighbourResample);

    // Save to PNG with the default options.
    image.save(dir + "downsample.nearestneighbour.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale up by 2 times using Bilinear resampling.
    image.resizeHeightProportionally(image.getHeight() * 2, com.aspose.imaging.ResizeType.BilinearResample);

    // Save to PNG with the default options.
    image.save(dir + "upsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // Scale down by 2 times using Bilinear resampling.
    image.resizeHeightProportionally(image.getHeight() / 2, com.aspose.imaging.ResizeType.BilinearResample);

    // Save to PNG with the default options.
    image.save(dir + "downsample.bilinear.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

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.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
    try {
        image.rotateFlip(rotateFlipType);
        image.save(dir + "sample." + rotateFlipType + ".png", new com.aspose.imaging.imageoptions.PngOptions());
    } finally {
        image.dispose();
    }
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage dicomImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) 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.
    dicomImage.dither(com.aspose.imaging.DitheringMethod.ThresholdDithering, 4, null);

    dicomImage.save(dir + "sample.ThresholdDithering4.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage dicomImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) 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.
    dicomImage.dither(com.aspose.imaging.DitheringMethod.FloydSteinbergDithering, 1, null);

    dicomImage.save(dir + "sample.FloydSteinbergDithering1.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) 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(
            djvuImage.getWidth() / 4, djvuImage.getHeight() / 4, djvuImage.getWidth() / 2, djvuImage.getHeight() / 2);
    djvuImage.crop(area);

    // Save the cropped image to PNG
    djvuImage.save(dir + "sample.Crop.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) 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();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Binarize the image with Otsu thresholding.
    djvuImage.binarizeOtsu();
    djvuImage.save(dir + "sample.BinarizeOtsu.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Binarize the image with a brightness difference of 5. The brightness is a difference between a pixel and the average of an 10 x 10 window of pixels centered around this pixel.
    djvuImage.binarizeBradley(5, 10);
    djvuImage.save(dir + "sample.BinarizeBradley5_10x10.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    djvuImage.grayscale();
    djvuImage.save(dir + "sample.Grayscale.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Set gamma coefficient for red, green and blue channels.
    djvuImage.adjustGamma(2.5f);
    djvuImage.save(dir + "sample.AdjustGamma.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Set individual gamma coefficients for red, green and blue channels.
    djvuImage.adjustGamma(1.5f, 2.5f, 3.5f);
    djvuImage.save(dir + "sample.AdjustGamma.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Set the brightness value. The accepted values of brightness are in the range [-255, 255].
    djvuImage.adjustBrightness(50);
    djvuImage.save(dir + "sample.AdjustBrightness.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Set the contrast value. The accepted values of contrast are in the range [-100f, 100f].
    djvuImage.adjustContrast(50f);
    djvuImage.save(dir + "sample.AdjustContrast.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

com.aspose.imaging.Image image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Apply a median filter with a rectangle size of 5 to the entire image.
    djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.MedianFilterOptions(5));
    djvuImage.save(dir + "sample.MedianFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Apply a bilateral smoothing filter with a kernel size of 5 to the entire image.
    djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.BilateralSmoothingFilterOptions(5));
    djvuImage.save(dir + "sample.BilateralSmoothingFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Apply a Gaussian blur filter with a radius of 5 and a sigma value of 4.0 to the entire image.
    djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.GaussianBlurFilterOptions(5, 4.0));
    djvuImage.save(dir + "sample.GaussianBlurFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Apply a Gauss-Wiener filter with a radius of 5 and a smooth value of 4.0 to the entire image.
    djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.GaussWienerFilterOptions(5, 4.0));
    djvuImage.save(dir + "sample.GaussWienerFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) 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.
    djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.MotionWienerFilterOptions(10, 1.0, 90.0));
    djvuImage.save(dir + "sample.MotionWienerFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

image = com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Apply a sharpen filter with a kernel size of 5 and a sigma value of 4.0 to the entire image.
    djvuImage.filter(djvuImage.getBounds(), new com.aspose.imaging.imagefilters.filteroptions.SharpenFilterOptions(5, 4.0));
    djvuImage.save(dir + "sample.SharpenFilter.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

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) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    com.aspose.imaging.fileformats.djvu.DjvuImage djvuImage = (com.aspose.imaging.fileformats.djvu.DjvuImage) image;

    // Scale down by 2 times using adaptive resampling.
    djvuImage.resize(image.getWidth() / 2, image.getHeight() / 2, resizeSettings);

    // Save to PNG
    djvuImage.save(dir + "downsample.adaptive.png", new com.aspose.imaging.imageoptions.PngOptions());
} finally {
    image.dispose();
}

String dir = "c:\\temp\\";

// Load an image from a DJVU file.
com.aspose.imaging.fileformats.djvu.DjvuImage image = (com.aspose.imaging.fileformats.djvu.DjvuImage) com.aspose.imaging.Image.load(dir + "sample.djvu");
try {
    // This call caches all the pages so that no additional data loading will be performed from the underlying data stream.
    image.cacheData();

    // Or you can cache the pages individually.
    for (com.aspose.imaging.fileformats.djvu.DjvuPage page : image.getPages()) {
        page.cacheData();
    }
} finally {
    image.dispose();
}