Spectrum 512 formats

File Format
Name	Spectrum 512 formats
Ontology	Electronic File Formats Graphics Atari graphics formats Spectrum 512 formats
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.

Format

There are three main file formats:

• Spectrum 512 Uncompressed (.spu)
• Spectrum 512 Compressed (.spc; signature="SP")
• Spectrum 512 Smooshed (.sps; signature="SP")

The image dimensions are always 320×199 pixels, though some decoders 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 are usually set to zero (except in the "Enhanced" variant). 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.

Related formats

Related formats described in other articles:

• Spectrum 512 Anispec (.sps; signature="SS")
• Spectrum 512 Extended (.spx; signature="SPX")

Software

• Konvertor
• RECOIL
• Netpbm: ppmtospu (v10.58+), sputoppm, spctoppm
• XnView

Sample files

• http://samples.libav.org/image-samples/atarist/spectrum512/ - SPU, SPC
• http://cd.textfiles.com/geminiatari/FILES/GRAPHICS/SPECPICS/ - SPC, SPS
• http://cd.textfiles.com/806atari/301-400/315/ - SPS

Resources

• ST Picture Formats
  • Spectrum 512
    • Spectrum 512 Enhanced
  • Spectrum 512 Compressed
  • Spectrum 512 Smooshed
• MultimediaWiki article