Is it possible to have a custom color bar?

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BN
BN on 3 May 2020
Commented: Steven Lord on 5 May 2020
Is it possible to have a custom color bar?
Dear all, I have a pre-plotted figure, Is it possible to add a color bar from -25 to 5600.
From light_brown = [0.95 0.9 0.8]; to brown_color = [0.8 0.2 0.1] to it?

Accepted Answer

Image Analyst
Image Analyst on 3 May 2020
Try this:
grayImage = imread('cameraman.tif');
% Rescale image to values -25 to 5600.
grayImage = rescale(double(grayImage), -25, 5600);
imshow(grayImage, []);
light_brown = [0.95 0.9 0.8];
brown_color = [0.8 0.2 0.1];
numColors = 256; % Whatever
redMap = linspace(light_brown(1), brown_color(1), numColors);
greenMap = linspace(light_brown(2), brown_color(2), numColors);
blueMap = linspace(light_brown(3), brown_color(3), numColors);
myColorMap = [redMap(:), greenMap(:), blueMap(:)];
colormap(myColorMap);
colorbar;
caxis([-25, 5600]);
  2 Comments
Steven Lord
Steven Lord on 5 May 2020
You may also find the colormapeditor useful in creating custom color maps.

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