Colormap setting the colors i want

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Tiago Dias 2018-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/408057-colormap-setting-the-colors-i-want

评论： Tiago Dias 2018-7-2

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

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Stephen23 2018-6-29

"But I don't want to use the colours Matlab provides..."

As well as the ones that MATLAB provides:

https://www.mathworks.com/help/matlab/ref/colormap.html

you can find plenty of colormaps on FEX:

https://www.mathworks.com/matlabcentral/fileexchange/?term=colormap

Tiago Dias 2018-6-29

I would like to create one has simples as Excel, red to green or green to red, with orange for middle values

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采纳的回答

Stephen23 2018-6-29

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编辑：Stephen23 2018-6-29

You can easily adjust colormaps by using the colormapeditor:

http://www.mathworks.com/help/matlab/ref/colormapeditor.html

As an alternative to defining the colormap matrix "by hand", you could use one of the colormap generators/creators on MATLAB FEX:

https://www.mathworks.com/matlabcentral/fileexchange?term=colormap+generator

https://www.mathworks.com/matlabcentral/fileexchange/?term=colormap+creator

https://www.mathworks.com/matlabcentral/fileexchange?term=colormap+custom

Some of them allow you to create a whole colormap from just a few RGB colors, e.g.:

https://www.mathworks.com/matlabcentral/fileexchange/54046-rgbmap-varargin-

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Tiago Dias 2018-7-2

编辑：Tiago Dias 2018-7-2

在 MATLAB Online 中打开

I tried to do this to save my colormap like this:

ax = gca;
mymap = colormap(ax);
save('MyColormap','mymap')

when I make

imagesc(B)
colormap mymap
colorbar

the colours are not what I saved previously, he uses Panula by default, because he doenst recognize mymap has a type of colours.

Tiago Dias 2018-7-2

在 MATLAB Online 中打开

Nevermind, i was typing it wrong

colormap(mymap)
works perfect, thanks for your first link it helped me a lot :)

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更多回答（2 个）

Image Analyst 2018-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/408057-colormap-setting-the-colors-i-want#answer_326843

在 MATLAB Online 中打开

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;