MATLAB: Colormap, how to get the color of the sea

bluecolormap

This is an interesting question to me. I wanted to create a nice colormap with very smooth and gradual transition from white to sea blue. I tried to do it manually in colormap but it does not work out very well. Anybody who has explored this, or know some developed colormap?

Many thanks

Best Answer

Try a program where you can easily get the RGB values of some color of blue that you like, like (r,g,b) = (rBlue, gBlue, bBlue). Then use linspace().

numColors = 256; % Good value for 24/32 bit displays.
oceanRed = 15;
oceanGreen = 127;
oceanBlue = 230;
myColorMap = [linspace(oceanRed, 255, numColors)'/255,...
  linspace(oceanGreen, 255, numColors)'/255,...
  linspace(oceanBlue, 255, numColors)'/255]
imshow('cameraman.tif');
colormap(gca, myColorMap);
colorbar

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MATLAB: How to create a white image

Try this to create a grayscale image:

whiteImage = 255 * ones(N, M, 'uint8');
imshow(whiteImage);

To create an RGB image, try this:

whiteImage = 255 * ones(480, 640, 3, 'uint8');
imshow(whiteImage);

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]);

Best Answer

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MATLAB: How to create a white image

MATLAB: Is it possible to have a custom color bar

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