CompuServe RLE
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'''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]]. | ||
== Identification == | == Identification == | ||
| − | Files begin with bytes | + | Files begin with bytes {{magic|0x1B 0x47 0x48}} (256×192) or {{magic|0x1B 0x47 0x4D}} (128×96). |
== Software == | == Software == | ||
| Line 17: | Line 17: | ||
* [[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}} |
== Resources == | == Resources == | ||
| − | * [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]) |
Latest revision as of 03:20, 28 December 2023
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.
Contents |
[edit] Identification
Files begin with bytes 0x1B 0x47 0x48 (256×192) or 0x1B 0x47 0x4D (128×96).
[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
