It doesn't seem to matter what program I re-save an image with or in what format, it always comes out with a lower quality/contrast/brightness version. I really can't figure out why.
Re-saved in Paint Windows 7 / Photoshop CS5 / IrfanView (Same result from all 3):
(I did a hash check to confirm that the upload is the same file as uploaded from my PC)
Animated GIF between the two to make the difference obvious:
It does not matter if I save it as PNG, JPEG, BMP, etc... I get the same lower-quality result.
Any idea why this is happening?