GEM Raster - Revision history

Dexvertbot: Change telparia.com samples link to template

2023-12-28T02:56:44Z

Change telparia.com samples link to template

Jsummers: /* Software */

2022-02-19T16:59:56Z

‎Software

Sembiance: Added extension

2020-08-14T20:39:34Z

Added extension

Sembiance: /* Sample files */

2020-07-26T20:40:40Z

‎Sample files

Sembiance: /* Software */

2020-05-26T16:18:38Z

‎Software

Sembiance: /* Sample files */

2020-05-26T16:18:23Z

‎Sample files

Sembiance: /* Sample files */

2020-05-26T16:17:31Z

‎Sample files

Jsummers at 19:56, 12 February 2017

2017-02-12T19:56:37Z

Jsummers at 13:23, 16 October 2016

2016-10-16T13:23:14Z

Marco at 14:56, 22 February 2016

2016-02-22T14:56:46Z

@@ Line 42: / Line 42: @@
 * http://cd.textfiles.com/crawlycrypt2/crm_demo/images16/ (XIMG)
 * http://sylvana.net/1stguide/snaps/ (Version 3 files)
-* https://telparia.com/fileFormatSamples/image/gem/
+* {{DexvertSamples|image/gem}}
 == See also ==

@@ Line 30: / Line 30: @@
 * [[Netpbm]]: pbmtogem, gemtopnm
 * [[XnView]]
 * {{Deark}}
 * [[RECOIL]]

@@ Line 2: / Line 2: @@
 |formattype=electronic
 |subcat=Graphics
-|extensions={{ext|img}}, {{ext|ximg}}
+|extensions={{ext|img}}, {{ext|ximg}}, {{ext|timg}}
 |pronom={{PRONOM|x-fmt/159}}
 |released=1985

@@ Line 41: / Line 41: @@
 * http://cd.textfiles.com/crawlycrypt2/crm_demo/images16/ (XIMG)
 * http://sylvana.net/1stguide/snaps/ (Version 3 files)
-* https://telparia.com/fileFormatSamples/image/test.gem.img
+* https://telparia.com/fileFormatSamples/image/gem/
 == See also ==

@@ Line 32: / Line 32: @@
 * {{Deark}}
 * [[RECOIL]]
 == Sample files ==

@@ Line 24: / Line 24: @@
 * [http://bitsavers.informatik.uni-stuttgart.de/pdf/digitalResearch/gem/Programmers_Toolkit/5149-2374-001_GEM3_Programmers_Toolkit_Version_3.1_Supplement_1989.pdf GEM/3 Programmer's Toolkit, Release 3.1 Supplement], sec. 9 p. 22
 * [http://www.seasip.info/Gem/ff_img.html Format of GEM bitmap]
-* [http://www.atari-forum.com/wiki/index.php?title=IMG_file Understanding color IMGs]
+* {{AtariForumWiki|IMG_file|Understanding color IMGs}}
 == Software ==
@@ Line 31: / Line 31: @@
 * [[XnView]]
 * {{Deark}}
 == Sample files ==

@@ Line 8: / Line 8: @@
 '''GEM Raster''' (or '''GEM VDI Bit Image''', '''GEM Bit Image''', '''GEM Image''', '''GEM Bitmap''', '''IMG''') is an image file format originally associated with the GEM operating environment by Digital Research. It was used by ''GEM Paint'' and ''Ventura Publisher'', and by a variety of Atari ST software.
-The format of bi-level images is well standardized, but the specification is ambiguous as to the format of color images. As a result, there are several incompatible flavors of color GEM raster images, some of which have their own names such as '''XIMG''' ('''Extended GEM Bit Image'''), '''STTT''', and '''Hyperpaint'''.
+The format of bi-level images is well standardized, but the specification is ambiguous as to the format of color images. As a result, there are several incompatible flavors of color GEM raster images, some of which have their own names, such as '''XIMG''' (Extended GEM Bit Image), '''TIMG''' (TrueColor IMG), '''STTT''', and '''Hyperpaint'''.
 == Identification ==
-Files begin with bytes {{magic|0x00 0x01}} or, in the case of some XIMG files, {{magic|0x00 0x02}}.
+Files begin with two bytes indicating the (big-endian) file version number. The version number is usually 1 (<code>0x00 0x01</code>), but some XIMG files have a version number of 2, and version number 3 has also been used.
 The next two bytes indicate the size of the header, in 2-byte ''words''. For example, a value of 8 means the header is 16 bytes, measured from the beginning of the file.
@@ Line 38: / Line 38: @@
 * http://cd.textfiles.com/fantaziasampler/CLIPART/IMG/
 * http://cd.textfiles.com/crawlycrypt2/crm_demo/images16/ (XIMG)
 == See also ==