Why is the imagedata value different from Win32 to MacOS

[Chipp Walters]

Yep, I believe Ian is correct in his assumption about gamma and
imageData. Interestingly, I checked both PNG and JPG and found, as you
did, the imageData different from one platform to the next.

I would've though JPG's would be the same, but that isn't the case.
Just wondering, how does this affect what you're trying to do?

-Chipp