Mario and Luigi set off to rescue the princess AGAIN! However they end up having to deal with something much much worse then Bowser trying to capture Peach!
Matt's Jpeg Killer™
I think I can help. Originally my comic PrtSc Land was exclusive to my computer and was always saved as JPEG since I didn't have PNG. When I finally decided to upload to SmackJeeves, in Paint (that's your cue to stop reading this if you use a different program) I set the foreground color to white and the background color to one that's not used in the strip I am trying to fix, then use eraser right-clicking to change everything that is exactly white to the unused color. Then I repeatedly do the same thing with white-like colors picked up with the color picker, then once I feel it's good enough I set the foreground to the unused color and the background to exactly white, then right-click erase. Once you've done all that, make sure you save it as a PNG right away or all your work will be for nothing.