2
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I tried to use ColorReplace to change the colors obtained from MorphologicalComponents. However some of the changes didn't follow the rules specified, Is there any reasons?

im2 = Binarize@Import["http://i.stack.imgur.com/ZDeYq.jpg"];
im3 = Colorize@ MorphologicalComponents@im2 
colors = DominantColors[im3, 5] 

enter image description here

Now trying to change the colors accordingly,

ColorReplace[im3, {
  colors[[2]] -> Red, 
  colors[[3]] -> Blue, 
  colors[[4]] -> Green, 
  colors[[5]] -> Yellow
  }]

One of the changes did not follow the rules specified:

enter image description here

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6
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The default tolerance (distance) of ColorReplace is such that first and third horses are considered similar:

enter image description here

ColorReplace[im3, colors[[2]] -> Red]

enter image description here

Use a smaller value for the distance parameter:

ColorReplace[im3, {
  colors[[2]] -> Red, 
  colors[[3]] -> Blue, 
  colors[[4]] -> Green, 
  colors[[5]] -> Yellow
  },
  0.01
]

enter image description here

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5
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What you want to do can be done way easier:

i = Binarize@Import["http://i.stack.imgur.com/ZDeYq.jpg"];
Colorize[MorphologicalComponents@i, 
 ColorRules -> {1 -> Red, 2 -> Blue, 3 -> Green, 4 -> Yellow}]

enter image description here

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  • $\begingroup$ Is that the color order different from the rule your specified? $\endgroup$ – Putterboy Sep 11 '14 at 8:14
  • $\begingroup$ The colors are in the order I specified. Keep in mind that the ordering depends on the order of components provided by MorphologicalComponents $\endgroup$ – paw Sep 11 '14 at 8:18

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