Enum PngColorType

Enum PngColorType

Namespace: Aspose.Imaging.FileFormats.Png
Assembly: Aspose.Imaging.dll (25.7.0)

Represents the PNG image color type.

public enum PngColorType

Fields

Grayscale = 0

Represents the color type where each pixel is a greyscale sample.

GrayscaleWithAlpha = 4

Represents the color type where each pixel is a greyscale sample followed by an alpha sample.

IndexedColor = 3

Represents the color type where each pixel is a palette index; a PLTE chunk shall appear.

Truecolor = 2

Represents the color type where each pixel is an R,G,B triple.

TruecolorWithAlpha = 6

Represents the color type where each pixel is an R,G,B triple followed by an alpha sample.

Examples

The following example shows how to compress a PNG image, using indexed color with best fit palette

// Loads png image        
                                                                                                                 string  sourceFilePath="OriginalRings.png";
                                                                                                                 string  outputFilePath="OriginalRingsOutput.png";
                                                                                                                 using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(sourceFilePath))
                                                                                                             {
                                                                                                                 image.Save(outputFilePath, new Aspose.Imaging.ImageOptions.PngOptions()
                                                                                                                 {
                                                                                                                      Progressive = true,
                                                                                                                          // Use indexed color type
                                                                                                                      ColorType = Aspose.Imaging.FileFormats.Png.PngColorType.IndexedColor,
                                                                                                                          // Use maximal compression
                                                                                                                      CompressionLevel = 9,
                                                                                                                   // Get the closest 8-bit color palette which covers as many pixels as possible, so that a palettized image
                                                                                                                      // is almost visually indistinguishable from a non-palletized one.
                                                                                                                      Palette = Aspose.Imaging.ColorPaletteHelper.GetCloseImagePalette((Aspose.Imaging.RasterImage)image, 256, Aspose.Imaging.PaletteMiningMethod.Histogram)
                                                                                                                 });
                                                                                                             }
                                                                                                                 // The output file size should be significantly reduced
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