[Wikipedia-l] Gimp question

[Pierre Abbat]

I'll probably be finished before anyone answers, but for future reference:

I downloaded the stick drawing of all amino acids and am cutting them apart. 
It is a PNG with one color set to transparent, which shows as dark gray 
checkers, which makes the writing, which is mostly black, hard to read. The 
acid group is well-nigh impossible to read. Is there a way to change the 
checkers to something lighter? I found a button at the lower left, which 
changes them to red checkers, but that's no better.

phma