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Spectrum 512 formats - Just Solve the File Format Problem

Spectrum 512 formats

From Just Solve the File Format Problem
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|extensions={{ext|spu}} {{ext|spc}}<br>{{ext|sps}}
 
|extensions={{ext|spu}} {{ext|spc}}<br>{{ext|sps}}
 
}}
 
}}
== Overview ==
 
 
The '''Spectrum 512 formats''' are a group of raster image file formats associated with the ''Spectrum 512'' paint program for Atari ST.
 
The '''Spectrum 512 formats''' are a group of raster image file formats associated with the ''Spectrum 512'' paint program for Atari ST.
  
Formats:
+
== Format ==
 +
There are three main file formats:
 
* Spectrum 512 Uncompressed (.spu)
 
* Spectrum 512 Uncompressed (.spu)
 
* Spectrum 512 Compressed (.spc)
 
* Spectrum 512 Compressed (.spc)
 
* Spectrum 512 Smooshed (.sps)
 
* Spectrum 512 Smooshed (.sps)
 +
 +
The image dimensions are always 320×199 pixels, but it seems to be standard practice to interpret them as being 320×200, with an all-black top row.
 +
 +
There are 4 bits of image data per pixel, which are interpreted using a complicated system of color palettes.
 +
 +
For uncompressed (.spu) files, the first 160 bytes of the file should be set to zero. Following that are 31840 bytes of image data (160 for each row). Following that are 19104 bytes of palette data. The total file size is 51104 bytes.
  
 
== Software ==
 
== Software ==
 
* [http://netpbm.sourceforge.net/ Netpbm]: ppmtospu (v10.58+), sputoppm, spctoppm
 
* [http://netpbm.sourceforge.net/ Netpbm]: ppmtospu (v10.58+), sputoppm, spctoppm
 +
* [http://www.xnview.com/ XnView]
  
 
== Sample files ==
 
== Sample files ==

Revision as of 22:23, 13 May 2013

File Format
Name Spectrum 512 formats
Ontology
Extension(s) .spu .spc
.sps

The Spectrum 512 formats are a group of raster image file formats associated with the Spectrum 512 paint program for Atari ST.

Contents

Format

There are three main file formats:

  • Spectrum 512 Uncompressed (.spu)
  • Spectrum 512 Compressed (.spc)
  • Spectrum 512 Smooshed (.sps)

The image dimensions are always 320×199 pixels, but it seems to be standard practice to interpret them as being 320×200, with an all-black top row.

There are 4 bits of image data per pixel, which are interpreted using a complicated system of color palettes.

For uncompressed (.spu) files, the first 160 bytes of the file should be set to zero. Following that are 31840 bytes of image data (160 for each row). Following that are 19104 bytes of palette data. The total file size is 51104 bytes.

Software

Sample files

Resources

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox

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