CompuServe RLE
From Just Solve the File Format Problem
(Difference between revisions)
(→Software) |
|||
| (4 intermediate revisions by 2 users not shown) | |||
| Line 3: | Line 3: | ||
|subcat=Graphics | |subcat=Graphics | ||
|extensions={{ext|rle}} | |extensions={{ext|rle}} | ||
| + | |wikidata={{wikidata|Q28205858}}, {{wikidata|Q105859195}} | ||
| + | |released=≤1986 | ||
}} | }} | ||
'''CompuServe RLE''' is a bi-level image format that was used by the [[CompuServe]] on-line service. In some ways, it is the predecessor of [[GIF]]. | '''CompuServe RLE''' is a bi-level image format that was used by the [[CompuServe]] on-line service. In some ways, it is the predecessor of [[GIF]]. | ||
| − | The image dimensions are | + | The image dimensions are 256×192 or (rarely?) 128×96. Images are [[Run-length encoding|RLE-compressed]]. |
Files consist entirely of [[ASCII]] characters, though some are [[C0 controls|control characters]]. | Files consist entirely of [[ASCII]] characters, though some are [[C0 controls|control characters]]. | ||
| + | |||
| + | See also [[Color RLE]]. | ||
== Identification == | == Identification == | ||
| − | Files begin with bytes | + | Files begin with bytes {{magic|0x1b 'G' 'H'}} (256×192) or {{magic|0x1b 'G' 'M'}} (128×96). |
| + | |||
| + | Usually, {{magic|0x1b 'G' 'N'}} appears at or near the end of the file. | ||
== Software == | == Software == | ||
| Line 17: | Line 23: | ||
* [[Tom's Editor]] | * [[Tom's Editor]] | ||
* {{Deark}} | * {{Deark}} | ||
| + | * {{CdTextfiles|simtel/stmsdos9709/disk1/DISC1/GRAPHICS/2SHOW204.ZIP|CompuShow 2000! v2.04a}} (DOS software) | ||
== Sample files == | == Sample files == | ||
* [http://www.classiccmp.org/cpmarchives/trs80/Software/Model%204/A/Assorted%20RLE%20Files%20(19xx)(Author%20Unknown)%5bRLE%5d.zip Assorted RLE Files.zip] | * [http://www.classiccmp.org/cpmarchives/trs80/Software/Model%204/A/Assorted%20RLE%20Files%20(19xx)(Author%20Unknown)%5bRLE%5d.zip Assorted RLE Files.zip] | ||
* ftp://8bitfiles.net/archives/compuserve-file-archive/22%20Graphics%20&%20Utilities/ → *.RLE | * ftp://8bitfiles.net/archives/compuserve-file-archive/22%20Graphics%20&%20Utilities/ → *.RLE | ||
| − | * | + | * {{DexvertSamples|image/compuServeRLE}} |
| − | == | + | == Links == |
| − | * [http://staticweb.rasip.fer.hr/research/compress/algorithms_run-length_coding.htm#examples CompuServe standard for RLE file format] | + | * [http://staticweb.rasip.fer.hr/research/compress/algorithms_run-length_coding.htm#examples CompuServe standard for RLE file format] ([https://web.archive.org/web/20140721001738/http://staticweb.rasip.fer.hr/research/compress/algorithms_run-length_coding.htm#examples archived]) |
| + | * [https://www.brutman.com/RLE/RLE_Graphics.html Rediscovering Compuserve RLE Graphics] | ||
Latest revision as of 18:10, 10 January 2026
CompuServe RLE is a bi-level image format that was used by the CompuServe on-line service. In some ways, it is the predecessor of GIF.
The image dimensions are 256×192 or (rarely?) 128×96. Images are RLE-compressed.
Files consist entirely of ASCII characters, though some are control characters.
See also Color RLE.
Contents |
[edit] Identification
Files begin with bytes 0x1b 'G' 'H' (256×192) or 0x1b 'G' 'M' (128×96).
Usually, 0x1b 'G' 'N' appears at or near the end of the file.
[edit] Software
- Netpbm (starting with version 10.48): cistopbm, pbmtocis
- Tom's Editor
- Deark
- CompuShow 2000! v2.04a (DOS software)
[edit] Sample files
- Assorted RLE Files.zip
- ftp://8bitfiles.net/archives/compuserve-file-archive/22%20Graphics%20&%20Utilities/ → *.RLE
- dexvert samples — image/compuServeRLE
