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Maciej
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colorbar: cdata and colors

Asked by Maciej
on 28 May 2012
Hi all,
I have a question related to colobar. I am using imagesc function to do some plots, the problem is the same value (cdata) are described by different colors in colorbar (for example in one plot 1.6 corresponds yellow, while in ohter plot yellow corresponds 1.3 ). So my question is how can I modify the colobar in that way in each plots the same values were described by the same color? Thanks in advance for help.
regards Maciek

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5 Answers

Answer by Teja Muppirala
on 29 May 2012
 Accepted Answer

The CAXIS command can used to set the scaling limits on the color, in the same way that you set XLIM or YLIM. For example:
figure
imagesc([1 2 3 4 5 6 7 8 9 10])
colorbar
figure
imagesc(5:.5:10)
ax2 = gca;
caxis(ax2,[1 10])
colorbar

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Answer by Stephen
on 29 May 2012

imagesc automatically scales your image to 'fit' to the colorbar. It can be a huge pain sometimes. If you can get away with it, just plot the images in the same picture like,
a=image 1
b=image 2
imagesc([a b])
they'd have to be the same size though...
another thing you could do is reset the range in the colorbar so that it matches the first image.
create a colormap and crop off some stuff,
cm = jet(100);cm(end-39:end,:)=[];colormap(cm)
or, you could just use image() to plot the pics... if they're too dark, just multiply them by some value so they show up nicely. good luck

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Answer by Eskapp
on 29 May 2012

Have a look to the function colormapeditor. There is a tutorial in Matlab documentation.
I think it is exactly what you need.

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Answer by Maciej
on 30 May 2012

Thanks Teja Muppirala,
Your answer turned out the simplest way to solove my problem, btw I tried before doing something with caxis function but I had to do someting wrong
Regards Maciek

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Answer by Matlab2010 on 8 Oct 2012

I have been trying to apply the answers given here to http://www.mathworks.com/matlabcentral/answers/50180-caxis-and-colorbar-scaling-issue but they do not seem to work.
Can anyone comment?

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