Question for color set in colorbar

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aurc89 2020-3-30

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评论： Ameer Hamza 2020-3-30

Hello,

I plot an image using imagesc, and the colorbar is automatically set from blue (lowest value, e.g. 0) to red (highest value, e.g. 1). Is there a way to set the interval color from white (lowest value) to red (highest value) ?

Thanks

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Ameer Hamza 2020-3-30

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编辑：Ameer Hamza 2020-3-30

在 MATLAB Online 中打开

You can also create you custom colormap

White = [1 1 1];
Red = [1 0 0];
t = linspace(0,1,100)';
cmap = Red.*t + White.*(1-t);
colormap(cmap);
colorbar

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aurc89 2020-3-30

Now it works! Thanks!

Ameer Hamza 2020-3-30

Glad to be of help.

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更多回答（2 个）

darova 2020-3-30

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Yes, there is a way. Use colormap

cmap = hot(100);
colormap(cmap(30:end,:))        % i use only last 70 values because first 30 is too dark
colorbar

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aurc89 2020-3-30

Thanks! But this gives the opposite (dark=minimum, white=maximum), what if I want the reversed one (white=minimum, dark=maximum) ?

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Image Analyst 2020-3-30

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Try this:

grayImage = imread('cameraman.tif');
white = [1 1 1];
red = [1 0 0];
imagesc(grayImage);
ramp = linspace(0, 1, 256)';
ramp = [ramp, ramp, ramp];
customColorMap = red .* ramp + white .* (1-ramp);
colormap(customColorMap);
colorbar