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how to get the RGB number from colorbar

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Yu Li
Yu Li on 18 Apr 2019
Edited: Yu Li on 18 Apr 2019
Hi:
I have a colorbar like below:
2.jpg
or to simplify this question, I assume the color is from blue (RGB [0,0,1]) to red (RGB [1,0,0]).
is there anyway to get the detail RGB nubmer for each color in this colorbar? in other words, I want to split the colorbar into 1000 parts, is there anyway to got the RGB number of each part?
Thanks!
Yu

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Answers (1)

Adam
Adam on 18 Apr 2019
Edited: Adam on 18 Apr 2019
colourmap = colormap( hAxes );
where hAxes is the axes handle. gca if you really must!
You can then interpolate it to make it bigger or smaller if you wish.
If it is a builtin colourmap though, for example 'Jet', you can just use
colourmap = jet( 1000 );
to get a 1000-element Jet colourmap (not that I am advising using Jet, it was just the one that came to mind and is most similar to the one you show).

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Yu Li
Yu Li on 18 Apr 2019
Thanks for you reply.
you mentioned 'then interpolate it to make it bigger or smaller', could you please let me know how I can do that?
for example, the colormap is from blue ([0,0,255]) to red ([255,0,0]), is there anyway to interpolate 1000 colors between them?
Bests,
Yu

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