Removing Values from Histogram

I want to remove gray levels of particular range from Histogram of an Image. Anyone Know how to do?

[Matt J]

And replace them with what?

Answer 1

[Image Analyst]

Let's say you had a masked image where a huge number of pixels were black and this produced a big spike in the histogram at zero. You can suppress this by setting that bin to zero.

[pixelCount, grayLevels] = imhist(grayImage, 256);
% Suppress zero bin:
pixelCount(1) = 0;
% Now plot:
bar(grayLevels, pixelCount);