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Plug-in Request - convert to 256 colors


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int interval = 64;
int R;
int B;
int G;
int A;
float divR;
float divB;
float divG;
float divA;
ColorBgra fin;

void Render(Surface dst, Surface src, Rectangle rect)
{
   for(int y = rect.Top; y < rect.Bottom; y++)
   {

       for (int x = rect.Left; x < rect.Right; x++)
       {
          ColorBgra source = src[x, y];
           divR = source.R/interval;
           divB = source.B/interval;
           divG = source.G/interval;
           divA = source.A/interval;
           R = (int)System.Math.Round(divR);
           B = (int)System.Math.Round(divB);
           G = (int)System.Math.Round(divG);
           A = (int)System.Math.Round(divA);
           R = R * interval;
           B = B * interval;
           G = G * interval;
           A = 255; //A * interval;
           fin.R = (byte)(R);
           fin.B = (byte)(;
           fin.G = (byte)(G);
           fin.A = (byte)(A);
           dst[x, y] =  fin;
       }
   }
}

I love math.

Explanation: a codelab script to make 256 colors without diffusion or dithering.

Also, for 16 colors, change int interval = 64; to int interval = 128; . And yes, this can be simplified. I just don't feel like it.

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  • 3 years later...

I have a low color file type plugin that supports saving images to 1bit, 4bit, 8bit and 16bit color depths. viewtopic.php?f=16&t=30638

Also without examining the code posted too much, does it do anything different to the Posterize effect (incuded in Paint.net)? I think setting each Posterize value to 8 (for Red, Green, Blue) will result in 256 possible colors

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