Odinbc wrote:
In Gimp Colors menu > select Info > select Smooth Palette...
Nice found, never seen this menu before, unfortunately there's no precise control on the palette with this, you can end up with thousands or hundreds shades, this tool seems to approximate the posterization only.
dd wrote:
I think you could use mathmap or a script to write a 64 x 64 image full of colours. Then, create a 4096 colour palette from the image. I think there was a plugin or something to get a palette from an image...
I don't know about mathmap but there's indeed the import palette from image (built-in gimp feature, pretty much hidden BTW) but once I have my RGB12bits palette I can't convert any image into this palette because it's not an 8-bit palette..
So, best guess now would be to convert a palette into an ICC color profile.. Question remains (: