We received a feature request to add support for indexed bit map color images. So my question for people is, is this really a feature more than one person would like to see added, and if so how would you use it?
8 bit color index mapped images used to be used quite a bit a long time ago, when memory was at a premium. An 8 bit (or less) black and white index is color mapped through a color lookup table. So when conserving memory in computers was a big deal, this mechanism was used to simulate a full color image while only using a single (1 byte per pixel) black and white image for storage (as opposed to 3 or 4 bytes per pixel for RGB or RGBA).
Studio Artist does let you simulate the artistic effects associated with color index mapping. You can use the Color Palette Map (or Color Gradient Map) image operation effects to map a black and white image channel through a color index.
But we don't currently support a color index mapped output file format.