Color dithering using Floyd-Steinberg error diffusion.
The image processing routine represents color dithering algorithm, which is based on error diffusion dithering with Floyd-Steinberg coefficients. Error is diffused on 4 neighbor pixels with the next coefficients:
| * | 7 | | 3 | 5 | 1 | / 16 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
Sample usage:
// create color image quantization routine ColorImageQuantizer ciq = new ColorImageQuantizer( new MedianCutQuantizer( ) ); // create 16 colors table Color[] colorTable = ciq.CalculatePalette( image, 16 ); // create dithering routine FloydSteinbergColorDithering dithering = new FloydSteinbergColorDithering( ); dithering.ColorTable = colorTable; // apply the dithering routine Bitmap newImage = dithering.Apply( image ); Initial image:
Result image:
private Bitmap reducedColor(Bitmap image, int numColors)
{
// create color image quantization routine
ColorImageQuantizer ciq = new ColorImageQuantizer(new MedianCutQuantizer());
// create 16 colors table
Color[] colorTable = ciq.CalculatePalette(image, numColors);
// create dithering routine
FloydSteinbergColorDithering dithering = new FloydSteinbergColorDithering();
dithering.ColorTable = colorTable;
// apply the dithering routine
Bitmap newImage = dithering.Apply(image);
return newImage;
}
public static Bitmap FloydSteinbergColorDithering(Bitmap bmp, int value)
{
// create color image quantization routine
ColorImageQuantizer ciq = new ColorImageQuantizer(new MedianCutQuantizer());
// create 16 colors table
Color[] colorTable = ciq.CalculatePalette(bmp, value);
// create dithering routine
FloydSteinbergColorDithering dithering = new FloydSteinbergColorDithering();
dithering.ColorTable = colorTable;
// apply the dithering routine
Bitmap newImage = dithering.Apply(bmp);
return newImage;
}
private static Bitmap QuantizeImage(KindleProfile profile, UnmanagedImage image)
{
Bitmap output;
FloydSteinbergColorDithering dithering = new FloydSteinbergColorDithering();
dithering.ColorTable = profile.Palette;
output = dithering.Apply(image);
return output;
}