Here's a screenshot of the issue:

Those are both gifs, but I've also seen this happening with PNGs, as well.

Gmail on all browsers is turning white space into this very light green. Anyone else experience this? I don't see it anywhere in my process (photoshop/exported image/coding in dreamweaver) until it's sent through gmail (both in my personal gmail and via litmus preview).

Anyone else experience this sort of thing? I can't find anything when attempting to search.