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

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

Answer 1

[Turlough Hughes]

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.

[Mathias Giesbrecht]

Thanks for the exemple!

the bulitin colormap turbo does perfectly the job

Answer 2

[J Chen]

Take a look at the colormap command - https://www.mathworks.com/help/matlab/ref/colormap.html

[Mathias Giesbrecht]

Thanks for the quick help!