Would it be possible to change the greyscale to a blue scale?

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Would it be possible to change this greyscale picture into a other color scale like in the two images? I tried some codes to make the binary into a color but i am trying to have something more clear to look than greyscale... Thank you

Accepted Answer

Turlough Hughes
Turlough Hughes on 4 Jan 2022
I don't think MATLAB has a blue scale colormap. You could do something custom, like the following. I'll use camerman for illustration:
I = imread('cameraman.tif');
imshow(I)
n = 128;
blueMap = [zeros(n/2,1) linspace(0,0.5,n/2).' linspace(0.5,1,n/2).';...
linspace(0,1,n/2).' linspace(0.5,1,n/2).' ones(n/2,1)];
figure()
imshow(I)
colormap(blueMap)
It's much simpler just using one of the builtin colormaps:
imshow(I)
colormap('copper') % or parula, hsv, bone, jet, etc.
  1 Comment
Mathias Giesbrecht
Mathias Giesbrecht on 4 Jan 2022
Edited: Mathias Giesbrecht on 4 Jan 2022
Thanks for the exemple!
the bulitin colormap turbo does perfectly the job

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More Answers (1)

J Chen
J Chen on 4 Jan 2022
Take a look at the colormap command - https://www.mathworks.com/help/matlab/ref/colormap.html

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