How to set manual values for colorbar

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Ihiertje
Ihiertje 2016-10-31
回答： LauraLee Austin 2016-10-31
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!

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回答（1 个）

LauraLee Austin
LauraLee Austin 2016-10-31
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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