I've created a small program that allows users to upload an image, and then resize that image one or more times depending on the desired outcome (once for web documents, twice for photo galleries, etc). Anyways, it seems that a large number of my clients are using older digital cameras to show case their businesses (most often resorts). This usually means taking pictures in poor lighting conditions which leaves the images either so black you can't see anything or completely washed out. I've seen a few functions on php.net that speak of changing color options, but so far these seem to be simple "make this purple square red now" types. Is there something built into PHP, or a 3rd party function that I'm not aware of, that would do simple color correction on uploaded files? I'm looking for a very quick and cheap "auto levels" like function found within Photoshop.
Any idea if this is even possible?
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