Kain: Looks like he's got colour conservation down pat.
Are there any other wacky pixel aspect ratios that pixel art is likely to have been created in?
var aspectRatios = {
"square" : [1, 1],
"wide" : [2, 1],
"tall" : [1, 2],
"cga32k" : [1.667, 1], // 160x200
"cga64k" : [1, 1.2], // 320x200
"cga128k" : [1, 2.4], // 640x200
"hercules" : [1, 1.552], // 720x348
"ega" : [1, 1.371], // 640x350
"apple2ehi" : [1, 1.094], // 280x192
"apple2edblhi" : [1.829, 1], // 560x192
};