Colormap setting the colors i want
149 views (last 30 days)
Show older comments
Hello, So I discovered Colormap, and I want to draw a Color map of a matrix A I got that has ranges from 0 to 1. But I don't want to use the colours Matlab provides (jet for example), I want to create my own. Green for 0, Red for 1, and in between a mix from red, yellow for 0.5, orange and then red. A bit like Excel does.
colormap('jet');
imagesc(A);
colorbar;
Thanks
2 Comments
Stephen23
on 29 Jun 2018
"But I don't want to use the colours Matlab provides..."
As well as the ones that MATLAB provides:
you can find plenty of colormaps on FEX:
Accepted Answer
Stephen23
on 29 Jun 2018
Edited: Stephen23
on 29 Jun 2018
You can easily adjust colormaps by using the colormapeditor:
As an alternative to defining the colormap matrix "by hand", you could use one of the colormap generators/creators on MATLAB FEX:
Some of them allow you to create a whole colormap from just a few RGB colors, e.g.:
3 Comments
More Answers (2)
Image Analyst
on 29 Jun 2018
Create your own colormap then assign values in whatever way you want:
numColors = 256; % Whatever....
myColorMap = zeros(numColors, 3); % Col1 = red, col2 = green, col3 = blue.
myColorMap(row1:row2, 1); % Set red values however you want.
... etc...
% Apply it.
colormap(handlesToMyAxes, myColorMap);
% Show bar
colorbar;
9 Comments
Wooshik Kim
on 29 Jun 2018
Edited: Wooshik Kim
on 29 Jun 2018
You can set your own colormap with the following
mymap = [0 0 0.3 0 0 0.4 0 0 0.5 0 0 0.6 0 0 0.8 0 0 1.0]; colormap(mymap)
where each column corresponds to Red, Green, Blue intensities between 0 and 1.
The following page might be helpful.
See Also
Categories
Find more on Orange in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!