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Build custom colormaps

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Build custom colormaps

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Buillds any sequence of colormaps based on wrgbcmyk colors

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Description

This function can be used to build your own custom colormaps. Imagine if you want to display rainfall distribution map. You want a colormap which ideally brings rainfall in mind, which is not achieved by colormaps such as winter, cool or jet and such. A gradient of white to blue will do the
task, but you might also use a more complex gradient (such as white+blue+red or colors='wbr'). This function can be use to build any colormap using main colors rgbcmyk. In image processing, w (white) can be used as the first color so that in the output, the background (usually with 0 values) appears white. In the example of rainfall map, 'wb' will produce a rainfall density map where the background (if its DN values are 0) will appear as white.

Inputs:
 colors: string (char) of color codes, any sequence of rgbcmywk
 representing different colors (such as 'b' for blue) is acceptable. If a
 gradient of white to blue is needed, colors would be 'wb'; a rainbow of
 white+blue+red+green would be 'wbrg'.

Example:
 [cmap]=buildcmap('wygbr');
%try the output cmap:
im=imread('cameraman.tif');
imshow(im), colorbar
colormap(cmap) %will use the output colormap

Acknowledgements

This file inspired Rgbmap Color Maps, Cubehelix Colormaps, and Color Brewer: Attractive And Distinctive Colormaps.

MATLAB release MATLAB 7.13 (R2011b)
Other requirements Not sure if you require mapping toolbox
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Comments and Ratings (4)
30 Oct 2014 Rafael Madrid  
11 Oct 2013 Ricardo

Thanks a lot! I was looking for this kind of function, you have just made my life easier!

27 Sep 2013 M Sohrabinia

@Alfredo: thanks for your comment, you mean the range of the output? such a 0 to 1?

13 Sep 2013 Alfredo

Very Good! It would be nice to have also the possibility to specify the desired size of the output colormap.

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