Figure display issue 'colormap(gray)'
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Hi
I have created a figure by using following code. The figure attached here. I have chose colormap(gray) and surprised why the background gray color in subplot(1,3,3) is different.
figure(1),
subplot(1,3,1);
imagesc(Shot);
color=caxis; caxis(color*.005);
colormap(gray);
subplot(1,3,2);
imagesc(Shot0);
color=caxis; caxis(color*.005);
colormap(gray);
subplot(1,3,3);
imagesc(Shot_sub);
color=caxis; %caxis(color*.005);
colormap(gray);
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Walter Roberson
le 20 Fév 2021
You are not doing the caxis(color*.005) in the last one.
When you do imagesc(), caxis should automatically become the range of values present in the data.
When you caxis() 0.005 times that range, you really restrict the range of mapping. If your data is positive, much of the data will turn white, unless your distribution is badly skewed (a possibility.)
In the last of the plots, you do not restrict the range to 1/200 of the value of the data, so if the data is positive, it is not going to be brightened as much as the others.
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