Find local differences in a matrix
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This is an image palette containing RGB value
cmap=
0 0 0
0.5019 0 0
0.7529 0.7529 0.752
0 0.5019 0.5019
1 0 0
0.5019 0.5019 0.50196
0 0 0.50196
1 1 1
1 1 0
0.5019 0.5019 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
calculate this formula
D(cmap)=cmap(x,y)- cmap(x,y-1)
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