PremultiplyComponents

TiffImage.PremultiplyComponents property

Indicate if components necessitate premultiplication, ensuring efficient handling of visual elements. Enhance rendering processes by toggling this property, streamlining graphic workflows for optimized performance.

public override bool PremultiplyComponents { get; set; }

Property Value

true if components must be premultiplied; otherwise, false.

Examples

The following example creates a new TIFF image, saves the specified semi-transparent pixels, then loads those pixels and gets final colors in the premultiplied form.

[C#]

int imageWidth = 3;
int imageHeight = 2;

Aspose.Imaging.Color[] colors = new Aspose.Imaging.Color[]
{
    Aspose.Imaging.Color.FromArgb(127, 255, 0, 0),
    Aspose.Imaging.Color.FromArgb(127, 0, 255, 0),
    Aspose.Imaging.Color.FromArgb(127, 0, 0, 255),
    Aspose.Imaging.Color.FromArgb(127, 255, 255, 0),
    Aspose.Imaging.Color.FromArgb(127, 255, 0, 255),
    Aspose.Imaging.Color.FromArgb(127, 0, 255, 255),
};

Aspose.Imaging.ImageOptions.TiffOptions createOptions = new Aspose.Imaging.ImageOptions.TiffOptions(Aspose.Imaging.FileFormats.Tiff.Enums.TiffExpectedFormat.TiffDeflateRgba);
createOptions.Source = new Aspose.Imaging.Sources.StreamSource(new System.IO.MemoryStream(), true);

using (Aspose.Imaging.FileFormats.Tiff.TiffImage image = (Aspose.Imaging.FileFormats.Tiff.TiffImage)Aspose.Imaging.Image.Create(createOptions, imageWidth, imageHeight))
{
    // Save pixels for the whole image.
    image.SavePixels(image.Bounds, colors);

    // The pixels are stored in the original image in the non-premultiplied form.
    // Need to specify the corresponding option explicitly to obtain premultiplied color components.
    // The premultiplied color components are calculated by the formulas:
    // red = original_red * alpha / 255;
    // green = original_green * alpha / 255;
    // blue = original_blue * alpha / 255;
    image.PremultiplyComponents = true;
    Aspose.Imaging.Color[] premultipliedColors = image.LoadPixels(image.Bounds);

    for (int i = 0; i < colors.Length; i++)
    {
        System.Console.WriteLine("Original color: {0}", colors[i].ToString());
        System.Console.WriteLine("Premultiplied color: {0}", premultipliedColors[i].ToString());
    }
}

//The output will look like this:
//Original color: Color [A=127, R=255, G=0, B=0]
//Premultiplied color: Color [A=127, R=127, G=0, B=0]
//Original color: Color [A=127, R=0, G=255, B=0]
//Premultiplied color: Color [A=127, R=0, G=127, B=0]
//Original color: Color [A=127, R=0, G=0, B=255]
//Premultiplied color: Color [A=127, R=0, G=0, B=127]
//Original color: Color [A=127, R=255, G=255, B=0]
//Premultiplied color: Color [A=127, R=127, G=127, B=0]
//Original color: Color [A=127, R=255, G=0, B=255]
//Premultiplied color: Color [A=127, R=127, G=0, B=127]
//Original color: Color [A=127, R=0, G=255, B=255]
//Premultiplied color: Color [A=127, R=0, G=127, B=127]

See Also

Pages VerticalResolution