Difference between revisions of "Spectrum 512 Enhanced file format"
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<pre> | <pre> | ||
| − | Spectrum Enhanced *.SPU | + | Spectrum 512 Enhanced *.SPU |
Spectrum 512 images with a 15-bit RGB palette. | Spectrum 512 images with a 15-bit RGB palette. | ||
| − | |||
Created by Sascha Springer: http://blog.anides.de/ | Created by Sascha Springer: http://blog.anides.de/ | ||
| Line 11: | Line 10: | ||
The upper 3 bits of a palette word are used to provide a 5th bit of RGB. Thus: | The upper 3 bits of a palette word are used to provide a 5th bit of RGB. Thus: | ||
| − | red: | + | red: 0xxx1432xxxxxxxx |
| − | green x0xxxxxx1432xxxx | + | green x0xxxxxx1432xxxx |
| − | blue: | + | blue: xx0xxxxxxxxx1432 |
These look like normal Spectrum 512 images by old viewers when the upper 3 bits are not used. | These look like normal Spectrum 512 images by old viewers when the upper 3 bits are not used. | ||
| + | |||
| + | As described by the creator: | ||
| + | The new least significant bit for each channel are now stored in the upper nibble of the | ||
| + | color word and so the image .SPU format itself is kept completely "backwards" compatible. | ||
</pre> | </pre> | ||
See also [[Spectrum 512 file format]] | See also [[Spectrum 512 file format]] | ||
Back to [[ST Picture Formats]] | Back to [[ST Picture Formats]] | ||
Latest revision as of 01:13, 4 June 2018
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: 0xxx1432xxxxxxxx green x0xxxxxx1432xxxx blue: xx0xxxxxxxxx1432 These look like normal Spectrum 512 images by old viewers when the upper 3 bits are not used. As described by the creator: The new least significant bit for each channel are now stored in the upper nibble of the color word and so the image .SPU format itself is kept completely "backwards" compatible.
See also Spectrum 512 file format
Back to ST Picture Formats
