fix bug with pixel counts over 2^30 #315
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It turns out GDI+ can't handle bitmaps that are over INT_MAX (2^32 - 1) in size. After a0217d8 we get a
ValueOverflowerror when callingLockBits. I changed the code to add a workaround for PNG and JPEG images, and setisOutOfMemorywhen we get aValueOverflow.I used this image to test: #187 (comment)
Also converted it to a JPEG and tested that