Assign specific colors to labelmatrix objects

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Veena Chatti 2020-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/606171-assign-specific-colors-to-labelmatrix-objects

Hi,

Does anyone know how to use imshow() with a custom colormap linking labeled objects to RGB colors?

I have a series of images with 200-250 objects. I extracted a colormap from one image assigned to the labeled objects, and now want to apply the same color to each labeled object in the series of images.

Here's how I extracted the RGB colors and linked them to the labelmatrix:

colors = NaN(257,4); 
for i = 1:max(LL(:)) % LL is my labelmatrix
    [r,c] = find(LL==i,1)
    colors(i,1) = i;
    colors(i,2) = RGB(r,c,1) % RGB contains the colors generated by 'turbo' and 'shuffle'
    colors(i,3) = RGB(r,c,2)
    colors(i,4) = RGB(r,c,3)
end