GEMImageDT is a DataType for GEM image files, as used by GEM Paint and
several other packages. These are also known as IMG files, after the
file-name suffix usually used.

Supported format variations:

  - Atari ST images up to 256 colours.
  - Two-colour black and white images.
  - 16-colour PC images.
  - Greyscale PC images.

Unsupported format variations:

  - High-colour and true-colour images.
  - Images whose format version is greater than one (this affects some files
    originating from the Atari ST platform).

Note that, unlike most DataTypes, this one only accepts files with one of
the standard file extensions for this format (.IMG and .XIMG). This is
because there would be a high risk of misidentifying other files as GEM
image files if file extensions were ignored. However, it is not assumed that
all files with one of the valid extensions is a GEM image file.

Please send bug reports, suggestions, and any other correspondence to the
author address above.

This package is released under the GNU General Public Licence.

History:

V1.3 (August 2020)

  - Now includes an AmigaOS 4.x version.
  - Fixed a crash when examining high-colour images.
  - Now accepts images that have one padding byte at the end.
  - Fixed a bug in the DataType descriptor that disallowed some images with
    32 colours or more.
  - Fixed a bug that caused all "ST/TT"-subformat images to be rejected.
  - Now allows an additional file extension: .XIMG.

V1.2 (December 2003)

  - Now supports most colour Atari images.
  - Fixed a memory leak when handling corrupt images.
  - New icons.

V1.1 (March 2002)

  - First release.

PERMISSION  UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP     NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[unknown]                 1779    2696  66.0% -lh5- 0ea4 Aug 20 00:23 GEMImageDT.info
[unknown]                 2300    3752  61.3% -lh5- 577d Aug 22 00:20 GEMImageDT/Classes/DataTypes/gemimage.datatype
[unknown]                 3925    8680  45.2% -lh5- 3f7a Aug 22 00:12 GEMImageDT/Classes/DataTypes/OS4/gemimage.datatype
[unknown]                 7009   18007  38.9% -lh5- fa00 Oct  5  2004 GEMImageDT/Copying
[unknown]                 1850    2786  66.4% -lh5- 4214 Oct  5  2004 GEMImageDT/Copying.info
[unknown]                   95     102  93.1% -lh5- 77bc Aug 19 23:53 GEMImageDT/Devs/DataTypes/GEMImage
[unknown]                 1762    2519  69.9% -lh5- c924 Oct  5  2004 GEMImageDT/Devs/DataTypes/GEMImage.info
[unknown]                  626    1405  44.6% -lh5- 3a67 Aug 22 03:03 GEMImageDT/Install
[unknown]                 1766    2588  68.2% -lh5- 9d1b Oct  5  2004 GEMImageDT/Install.info
[unknown]                  931    1859  50.1% -lh5- e6c2 Aug 21 23:54 GEMImageDT/Read Me
[unknown]                 1850    2786  66.4% -lh5- eb35 Oct  5  2004 GEMImageDT/Read Me.info
[unknown]                 1860    2762  67.3% -lh5- 594a Oct  5  2004 GEMImageDT/Source.info
[unknown]                 1365    3394  40.2% -lh5- c846 Aug 15 03:27 GEMImageDT/Source/compatibility.h
[unknown]                 2070    7519  27.5% -lh5- 0d8f Aug 13 00:22 GEMImageDT/Source/datatype.c
[unknown]                  842    1825  46.1% -lh5- 7332 Aug 21 23:56 GEMImageDT/Source/datatype.h
[unknown]                  621    1238  50.2% -lh5- 558a Aug 13 00:44 GEMImageDT/Source/datatype_protos.h
[unknown]                 3971   15761  25.2% -lh5- b59c Aug 21 23:17 GEMImageDT/Source/gemimage.c
[unknown]                  533     889  60.0% -lh5- 4589 Aug  9 06:56 GEMImageDT/Source/gemimage_protos.h
[unknown]                 1077    3541  30.4% -lh5- 6d9b Aug 22 00:10 GEMImageDT/Source/initializers.h
[unknown]                  331     579  57.2% -lh5- c607 Aug 13 00:31 GEMImageDT/Source/Makefile
[unknown]                  379     646  58.7% -lh5- 7984 Aug 13 00:30 GEMImageDT/Source/Makefile.OS4
[unknown]                 1573    6110  25.7% -lh5- 535f Aug 13 00:25 GEMImageDT/Source/os4_datatype.c
[unknown]                  551     943  58.4% -lh5- 46da Aug 13 00:23 GEMImageDT/Source/startup.c
---------- ----------- ------- ------- ------ ---------- ------------ ----------
 Total        23 files   39066   92387  42.3%            Aug 22 03:15