Legacy ImageMagick Discussions Archive

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convert xc:red xc:orange xc:yellow xc:lime xc:cyan xc:blue xc:magenta xc:white xc:black +append colormap.png

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identify -verbose colormap.png

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convert logo.png +dither -remap colormap.png logo_mapped.png

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identify -verbose logo_mapped.png

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  Histogram:
     17738: (  0,  0,  0) #000000 black
     14104: (  0,  0,255) #0000FF blue
      3942: (255,  0,  0) #FF0000 red
      6487: (255,165,  0) #FFA500 orange
      2089: (255,255,  0) #FFFF00 yellow
    262840: (255,255,255) #FFFFFF white

  Colormap entries: 7
  Colormap:
         0: (255,255,255) #FFFFFF white
         1: (255,255,  0) #FFFF00 yellow
         2: (255,165,  0) #FFA500 orange
         3: (  0,  0,  0) #000000 black
         4: (255,  0,  0) #FF0000 red
         5: (  0,  0,255) #0000FF blue
         6: (  4,  7,  7) #040707 srgb(4,7,7)