Since a few people wanted a 256-color version of the palette I wrote about a few days ago, here it is:
https://raw.githubusercontent.com/stefa ... te-256.png
Note that this version of the palette looks a bit asymmetrical. This is because the RGB332 color space is non-uniform where the blue color component is only half the size of the red and green color components. This irregularity becomes very evident when visualizing the palette.
When converting images to the Spectrum Next, much better results are obtained by using the 512-color palette. However, for some types of games it's convenient to use the standard 256-color palette.
The 256-color palette files (.pal, .act etc) have also been updated:
https://github.com/stefanbylund/zxnext_ ... r/palettes
Previously, these palette files used [0, 85, 170, 255] for the blue component but have been updated to use [0, 109, 182, 255] instead. This is done in order to take into account that the RGB332 colors are auto-extended to RGB333 colors by the Next hardware when being displayed.