Merging different color channels

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Mustapha Seidu
Mustapha Seidu on 17 Aug 2021
Commented: Bjorn Gustavsson on 17 Aug 2021
Hi, is it possible to merge color channels from different color spaces to sort of form a new 3-dimensional image for the purpose of analysis?
For example, I am trying to extract channels L, G, and V from CIELAB, RGB, and HSV respectively and merge them before proceeding to perform further manipulations to the image. Is that possible? If not, what is the closest I can get to that?

Answers (1)

Bjorn Gustavsson
Bjorn Gustavsson on 17 Aug 2021
Sure, they are after all nothing but 2-D arrays representing different aspects of an image. Just combine them any which way you see fit. Make sure that you have the different channels in compatible types such that you don't lose precision (convert to double etc).
  2 Comments
Bjorn Gustavsson
Bjorn Gustavsson on 17 Aug 2021
That's the problem I hinted at with my caution about "compatible types" - it seems like your HSV-image are in double format normalized to the 0 - 1 range while the others are uint8 in the range 0 - 255. Simply cast the L and G channels to doubles and scale them to 0 - 1:
L = double(L);
L = (L - min(L(:)))/(max(L(:))-min(L(:)));
% or simpler:
L = normalize(L,'range'); % I'm too old to remember this function
Then you can do the same for G, typically also check the data-type using whos and the range of the intensities using max and min.

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