MATLAB: Customize color map for temperature and precipitation

colormapMATLAB

Hi I tried to plot a map using (pcolorm) and by default it get those colors :

My teacher want me to create only a small number of color bins . For temperature from red to blue and for precipitation from brown to green. Like the figure below:

Can someone help me create those colors bins?

Best Answer

I tried the first script you told me but I want to reverse the colors. Bleu for negative anamoly values and red for positive. How can I do that? Also for precipitation I want colors from brown (negative) to green (positive)

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MATLAB: Is it possible to have a custom color bar

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]);

MATLAB: Colorbar with three colors

Z = peaks(100) ;
surf(Z)
shading interp 
cmap = [1 0 0 ; 0 1 0 ; 0 0 1] ;
colorbar
colormap(cmap)

Best Answer

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MATLAB: Is it possible to have a custom color bar

MATLAB: Colorbar with three colors

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