Can I make an automatic colorbar that ignores zeros?

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

Answer 1

[Image Analyst]

Find the non-zero min of your data

maxValue = max(indexedImage);
minValue = min(indexedImage(indexedImage ~= 0));
caxis([minValue, maxValue]);

[Scott Smith]

Just answered a question I've had for quite some time. Beautifly simple. Thank you.