Can I make an automatic colorbar that ignores zeros?

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Yoav Romach
Yoav Romach 2017-3-5
评论： Scott Smith 2022-8-19
Hey,
I'm doing 2d scanning with matlab, I'm plotting the data using imagesc and I do it after every line scan. The initial value for the matrix is all zeros. This means that if I use "caxis auto" I always get that the lower bound for the picture's colorbar is zero and it only changes after after the whole picture is taken. See attached image.
I'm looking for a way to use the automatic colormap, but make it ignore the zeros in the picture. Is there anyway to do it?
Thanks

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Image Analyst
Image Analyst 2017-3-5
Find the non-zero min of your data
maxValue = max(indexedImage);
minValue = min(indexedImage(indexedImage ~= 0));
caxis([minValue, maxValue]);

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