saving edited colormap data

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Adi Natan 2015-7-9

3
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https://ww2.mathworks.cn/matlabcentral/answers/229286-saving-edited-colormap-data

编辑： Walter Roberson 2018-6-6

After editing an existing colormap with the colormapeditor, I want to save it. The documentation states that I should do something like:

mycmap = get(fig,'Colormap');

However, the saved colormap, mycmap, has the original colormap data not the eddited one. Here's a minimal example:

imagesc(peaks(10));
colormap(hot(6))

Now go into the figure's gui colormap editor using >Edit>Colormap and only change yellow to blue. Now after that press Apply see that indeed the figure has changed. Now write on the command line:

mycmap = get(gcf,'Colormap')
 mycmap =
5000         0         0
0000         0         0
0000    0.5000         0
0000    1.0000         0
0000    1.0000    0.5000
0000    1.0000    1.0000

there no "blue" ([0 0 1]) color. Interestingly, when the figure is saved the colormap is saved with it, but for some reason I cant access the edited colormap. What am I doing wrong? (I'm using Matlab 2014b)

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Adi Natan 2015-10-12

14
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https://ww2.mathworks.cn/matlabcentral/answers/229286-saving-edited-colormap-data#answer_195719

在 MATLAB Online 中打开

It looks like the colormap is now associated with the axes rather than the figure. So,

cmap = colormap(gca);

will retrieve the edited map.

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Adi Natan 2015-12-28

saying "So use gca" is a very partial answer. I had to go and investigate how one should use gca, and that was far from the regular way gca is usually used (i.e. set(gca...) ). that is why I felt I had to write the full answer.