GEM / IMG – Maximum bits: 24

GEM / IMG is a fairly ancient format, and you probably won't want to bother with it unless you like old versions of Ventura Publisher. There are actually quite a few variations on IMG files – they handle monochrome and gray level images. Graphic Workshop supports files with up to 256 levels of gray and 24-bit IMG files with up to sixteen-million colours. Note that 24-bit IMG files are only supported by Ventura 4.0 and better.