Files of this type were created in GEM applications such as Ventura Publisher, GEM Draw, GEM Scan and GEM Paint.
The format allows monochrome, gray scale and color images with a variety of possible color depths, however many applications which are compatible with this format may only be able to read certain variants (for example, just monochrome or 24 bit True Color which are the most common variants).
The data in these files can be compressed using a Run-length compression scheme, however in practice, many programs create files that are not compressed.
A technical discussion of this format can be found in Chapter 8 of Graphics File Formats† by David C. Kay and John R. Levine.
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