Adjust contrast while ignoring background

Hello,

I have some images that I’m trying to process using graphicsmagick. It’s going well so far but I’m running into a problem with the effects, at least I think I am feel free to correct me.

I have “sparse images” meaning they have a white background and a few figures on them. When I try using something like histogram equalization, or image increasing the contrast I feel like the output is being heavily skewed by the many many white pixels in the background.

Is there a way around this problem? I’ve tried making the background transparent then running these methods to no avail.

Thanks for any help!
Ahmed
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