Colormap, how to get the color of the sea

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Xin
Xin 2016-12-1
编辑： DGM 2023-1-3
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

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Image Analyst
Image Analyst 2016-12-1
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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DGM
DGM 2023-1-3
编辑：DGM 2023-1-3
Ran in:
The variable numColors specifies the number of tuples (rows) in the colormap. It's easy enough to test.
numColors = 5; % change the value and see what happens
oceanRed = 15;
oceanGreen = 127;
oceanBlue = 230;
myColorMap = [linspace(oceanRed, 255, numColors)'/255,...
linspace(oceanGreen, 255, numColors)'/255,...
linspace(oceanBlue, 255, numColors)'/255]
myColorMap = 5×3
0.0588 0.4980 0.9020 0.2941 0.6235 0.9265 0.5294 0.7490 0.9510 0.7647 0.8745 0.9755 1.0000 1.0000 1.0000

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