How to add gray to out of range in the colormap?

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Kalasagarreddi Kottakota 2021-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/1589714-how-to-add-gray-to-out-of-range-in-the-colormap

评论： Mathieu NOE 2021-11-18

采纳的回答： DGM

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Hi,

How to add gray color to out of range colormap, inorder to have bettter visulaization. In the following code, I need gray color for values which are not between 10 to 60.

imagesc(xFocP,yFocP,Ax_map);
colormap jet;
colorbar;
caxis([10 60])

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DGM 2021-11-18

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You might try something like this:

[x y z] = peaks(100);

surf(x,y,z);

shading flat

camlight

numcolors = 64;

g = [1 1 1]*0.8;

cmap = parula(numcolors);

cmap = [g; cmap; g];

cextents = [-4 5];

offset = range(cextents)*(size(cmap,1)/numcolors - 1)/2;

caxis(cextents + [-offset offset])

colormap(cmap)

colorbar

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Kalasagarreddi Kottakota 2021-11-18

Thank you

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Mathieu NOE 2021-11-18

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coming too late in the show ....

hello

my 2 cents suggestion :

% dummy data 
N = 25;
Z = peaks(N);
Z = Z*5+35;
ZZ = Z;
ind = find(Z<10 | Z>60);
ZZ(ind) = 0;
% plot
figure
imagesc((1:N),(1:N),ZZ);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
n = 128; % dark grey => decrease n; light grey => increase n; 
tmp = [n n n]/255; % grey color
mymap = [tmp;jet(255)];     % my colormap
colormap(mymap);
hcb=colorbar('ver'); % colorbar handle
hcb.Limits = [10 60];
hcb.FontSize = 12;
hcb.Title.String = "Range";
hcb.Title.FontSize = 15;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%