Sonic the hedgehog 2-Super Sonic Rip

[The_Doom-ed_one]

Genecyst uses a less accurate method of color conversion, its screenshots are darker
Gens uses a more accurate method for the 16-bit screen output, however its screenshot function bit-shifts those values into 24-bit, so a Print Screen screenshot and screenshot from the emulator will produce different colors on most machines.
If you're using the Kmod extension of Gens, its tile and sprite tools also use a less accurate method of color conversion.

I used Gens, but I know what you mean about the screenshot function shifting the colors which is why I had to manually change the color from the sprite I took from the screenshot to match the rest of the sheet. It was more painful that I had anticipated.

How about SonikSprite? Is that accurate enough in terms of color?