IMG File Format
   
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GEM IMG

Short Name IMG
Long Name GEM IMG
Typical File Extensions .img
Contains Bitmap


This is the native format for storing bitmaps in the GEM graphic user interface system that was popular on PCs in the 1980s (versions of GEM were also available on some other computer systems such as the Atari ST).

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 TrueColor 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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  • Graphics File Formats
     
    Graphics File Formats
         		  
    By David C. Kay

    McGraw-Hill Companies
    Paperback (496 pages)

    Product Description:
    For software developers, systems managers, and computer hobbyists, this book will help bring a welcome sense of order to the chaotic world of graphics file format. David Kay and John Levine have compiled detailed specifications for 30 popular graphics file formats, so readers can more quickly and easily decide which standards are best for their applications.

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