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Red Blue Colormap

5.0 | 3 ratings Rate this file 97 Downloads (last 30 days) File Size: 1.47 KB File ID: #25536 Version: 1.0
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Red Blue Colormap



A colormap from bright blue, through white, and then to bright red.

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File Information

REDBLUE(M), is an M-by-3 matrix that defines a colormap.
The colors begin with bright blue, range through shades of blue to white, and then through shades of red to bright red. REDBLUE, by itself, is the same length as the current figure's colormap.


This file inspired Bipolar Colormap, Rgbmap Color Maps, Cubehelix Colormaps: Beautiful, Distinct, Versatile!, and Color Brewer: Attractive And Distinctive Colormaps.

MATLAB release MATLAB 7.7 (R2008b)
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Comments and Ratings (6)
02 Apr 2015 Stephen Cobeldick

@Rob Campbell: a good idea, but that code give the wrong length output if |m| is odd. Here is one possible fix:

n = fix(m/2);
x = n~=(m/2);
r = [(0:1:n-1)/n,ones(1,n+x)];
g = [(0:1:n-1)/n,ones(1,x),(n-1:-1:0)/n];
b = [ones(1,n+x),(n-1:-1:0)/n];
c = [r(:),g(:),b(:)];

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06 Jun 2014 Felipe Orellana

Hi Adam,

I downloaded your redblue colormap. It's nice.

Thanks a lot dude. I appreciate your effort.

thank you very much,


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28 Dec 2010 chsharrison

Just what I was looking for

21 Oct 2010 Mathias Vanwolleghem  
08 Jan 2010 Rob Campbell

Rob Campbell (view profile)

Thankyou: nice colormap. What do you think of this? A neater way to obtain c:

n = fix(0.5*m);
r = [(0:1:n-1)/n,ones(1,n)];
g = [(0:n-1)/n, (n-1:-1:0)/n];
b = [ones(1,n),(n-1:-1:0)/n];
c = [r(:), g(:), b(:)];

09 Oct 2009 Xianmin

The function "colormapeditor" from MATLAB will be helpful to customizer the colormap

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