How to add gray to out of range in the colormap?
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Kalasagarreddi Kottakota
on 18 Nov 2021
Commented: Mathieu NOE
on 18 Nov 2021
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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Accepted Answer
DGM
on 18 Nov 2021
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
More Answers (1)
Mathieu NOE
on 18 Nov 2021
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;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/804839/image.png)
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