Nance: Simple meaning that its some simple format easily read back in by their renderer. If its saved out as a jpg for example that can be slow to process since it takes time to decompress. Depending on what they use the file for its either RLE or flat meaning its a gray scale 1:1 saved format. More than liekly its flat meaning it has no compression and is just wxh bytes. I'd be willing to be photoshop's RAW file format would read it in. Or it could also be a bmp format simple renamed.