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February 9th 2009, 04:40 PM
spike.gif
If it looks okay with true colour on and off, the only significant difference is in file size. If the graphic uses more than 256 colours it can look very crappy in 8-bit (Try doing this to a photo ). If the graphic uses 256 colours or less, though, using 24-bit is just an unnecessary increase in file size. You can use 4-bit and 1-bit, too. The lantern light graphics should be 1-bit, for example, since they only use two colours.

A word of caution, though: When decreasing colour depth the colours are usually slightly changed, so you might end up with background colours that are not "pure" black or white, causing boxes to appear around them when playing in true colour mode. Some programs have the option that it doesn't alter the colours (Paint Shop Pro does, I think) but if you're using something like IrfanView it can be a real pain.