Custom colour bar, excluding the Blue from RGB.

Question

Jigsaw 2020-1-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/500648-custom-colour-bar-excluding-the-blue-from-rgb

评论： Star Strider 2020-1-17

I made a custom colour bar where 100 fell exactly at green and 200 at red. Anything from 0 to 100 along with their colours in insignificant and I'd prefer they do not show up in the colour bar. That being said, I would specifically like to have the colour bar such that it starts at the lowest (green) at 100 and ends at the highest (red) at 200.

I used the following code for the image.

figure()
A = [200 200 200 200 200; 200 200 200 200 200; 200 200 100 200 200; 200 200 200 200 200; 200 200 200 200 200];
Percent_matrix = flipud (A);
Percent_Interp = imresize(Percent_matrix,200,'bilinear');
pcolor(Percent_Interp)
shading interp
caxis([0 200])
load CustomColourMap
colormap( CustomColourMap );
colorbar();

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Answer 1

Star Strider 2020-1-16

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/500648-custom-colour-bar-excluding-the-blue-from-rgb#answer_410495

编辑：Star Strider 2020-1-16

在 MATLAB Online 中打开

Define ‘CustomColourMap’ as:

CustomColourMap = @(x) [linspace(0,1,x).' linspace(1,0,x).' zeros(x,1)];

then to use it:

CustomColourMap = @(x) [linspace(0,1,x).' linspace(1,0,x).' zeros(x,1)]; 
figure()
A = [200 200 200 200 200; 200 200 200 200 200; 200 200 100 200 200; 200 200 200 200 200; 200 200 200 200 200];
Percent_matrix = flipud (A);
Percent_Interp = imresize(Percent_matrix,200,'bilinear');
pcolor(Percent_Interp)
shading interp
caxis([100 200])
% load CustomColourMap
colormap( CustomColourMap(64) );
colorbar();

produces:

Custom colour bar, excluding the Blue from RGB - 2020 01 16.png

EDIT —

Corrected typographical error.

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Jigsaw 2020-1-17

The result is perfectly the way i wanted it. Nice of you to display the final image after using the updated code.

Thank you.

Cheers!

Star Strider 2020-1-17

As always, my pleasure!

Thank you! The plot is the intent of your Question and my Answer, so posting it is necessary!

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Answer 2

Stijn Haenen 2020-1-16

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/500648-custom-colour-bar-excluding-the-blue-from-rgb#answer_410490

在 MATLAB Online 中打开

Maybe you can try this:

h=figure();
A = [200 200 200 200 200; 200 200 200 200 200; 200 200 100 200 200; 200 200 200 200 200; 200 200 200 200 200];
Percent_matrix = flipud (A);
Percent_Interp = imresize(Percent_matrix,200,'bilinear');
pcolor(Percent_Interp)
shading interp
caxis([0 200])
colorbar();
h.Children(1).Limits=[100 200];
set(h,'Colormap',[Colormap_data]) % colormap data should be RBG codes: [[0.2422,0.1504,0.66030;0.2444,0.1534,0.6728;0.2464,0.1569,0.6847; ..... ]