The Qu's rips

[xdonthave1xx]

Just remember, if you're going to rip from the emulator (screenshots), take a few practice shots to see how the emulator takes the pictures. If you have filters on, most likely the pictures will also have the filters applied. (Worse case if you like playing with filters, you can have another copy of the emulator and have the settings without filters).
Never really used Megasis, but another warning with Gens as I said anything in the window gets caught, if you resize the window to something weird (like x1.5 by x2.3 size, images will end up at the weird dimensions also [Genesis screen dimensions are 256 x 224 pixels and 320 x 224 pixels (it switches from game to game and even scene to scene [screenshotting judge on an emulation site due to site not having had a lot of game have screenshots and Genesis was one of the last systems we finished screenshotting for])]

So, maybe with Megasis the window (and fullscreen is the same as window size for Gens) dimensions aren't a problem (for all I know, its like almost every other emulator and screen captures are of the screen dimensions of the system), but just remember filters could ruin you screenshots for sprite ripping.

Don't worry about the ripping, that's the easy part. The hard part is arranging them No, seriously. Arranging them is the hardest part :o