How to set manual values for colorbar

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Ihiertje
Ihiertje on 31 Oct 2016
Answered: LauraLee Austin on 31 Oct 2016
Hi,
I want to create an colorbar with three colors (red, yellow, green) and I want to set the values for these colors.
For example:
Red = 100 to max value image
Yellow = 50-100
Green - 0-50
Can someone help me how to set the values for the colors manually.
Thanks!

Answers (1)

LauraLee Austin
LauraLee Austin on 31 Oct 2016
Let's assume the max value is 128 and your data is in a matrix X. I'm going to modify a demo file of earth to have values greater than 100 for this example.
m=128; % set max value
c=zeros(m,3); % start with all 0's
c(1:50,2)=1; %green
c(100:128,1)=1; %red
c(51:99,1)=1; %yellow
c(51:99,2)=1; %yellow
load earth
X=X*2;
image(X)
colormap(c)
colorbar

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