Color dithering with a thresold matrix (ordered dithering).

The class implements ordered color dithering as described on Wikipedia. The algorithm achieves dithering by applying a threshold map on the pixels displayed, causing some of the pixels to be rendered at a different color, depending on how far in between the color is of available color entries.

The image processing routine accepts 24/32 bpp color images for processing. As a result this routine produces 4 bpp or 8 bpp indexed image, which depends on size of the specified color table - 4 bpp result for color tables with 16 colors or less; 8 bpp result for larger color tables.

Sample usage:

// create color image quantization routine ColorImageQuantizer ciq = new ColorImageQuantizer( new MedianCutQuantizer( ) ); // create 256 colors table Color[] colorTable = ciq.CalculatePalette( image, 256 ); // create dithering routine OrderedColorDithering dithering = new OrderedColorDithering( ); dithering.ColorTable = colorTable; // apply the dithering routine Bitmap newImage = dithering.Apply( image );

Initial image:

Result image:

OrderedColorDithering Class Documentation
Ejemplo n.º 1
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 public static Bitmap OrderedColorDithering(Bitmap bmp, int value)
 {
     // create color image quantization routine
     ColorImageQuantizer ciq = new ColorImageQuantizer(new MedianCutQuantizer());
     // create 256 colors table
     Color[] colorTable = ciq.CalculatePalette(bmp, value);
     // create dithering routine
     OrderedColorDithering dithering = new OrderedColorDithering();
     dithering.ColorTable = colorTable;
     // apply the dithering routine
     Bitmap newImage = dithering.Apply(bmp);
     return newImage;
 }