Spectrum 512 Enhanced file format

Spectrum 512 Enhanced    *.SPU

Spectrum 512 images with a 15-bit RGB palette.
Created by Sascha Springer: http://blog.anides.de/

These are identical to Spectrum 512 uncompressed images with two exceptions.
The very first long of the image data will be the file id: '5BIT'
Spectrum 512 can't display the first scan line anyway, so the id should cause no issues.

The upper 3 bits of a palette word are used to provide a 5th bit of RGB. Thus:
  red:  xx0x1432xxxxxxxx
  green x0xxxxxx1432xxxx
  blue: 0xxxxxxxxxxx1432

These look like normal Spectrum 512 images by old viewers when the upper 3 bits are not used.

See also Spectrum 512 file format

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