I had a script developed by someone here on SL awhile ago and I can't get in touch with him anymore so I'm opening up this problem to other people. The script takes a .zip file and extracts it, and displays thumbnails for all the images in the zip, eventually converting all the png/gif/jpg to jpg at a small compression.
Sometimes with PNGs the image "corrupts" or something. I've attached a sample of what it looks like. That image is supposed to be a solid black image but as you can see there are lines all over it.
I will provide the winning programmer with the code for the class and a sample image that corrupts and they will troubleshoot & explain why it's happening and code a solution for it.