megabits
Thank you for clarifying…
1. If you use a color-mapped picture, 3DS uses the color map and doesn't
expand its datastructure to 24-bits for the color. Saves alot of memory
this way.
2. If you use an image smaller than your background and choose to rescale
it up to fit the output size, it _will_ be interpolated on the way up. A
method of bilinear interpolation is used to come up with something that
looks as good as possible.
– G