Re: [Gimp-developer] Converting 8-bit integer color palettes to floating point



Hi All,

It seems to me - I could be wrong - that it would be very easy to add a line to the palette files that specifies the babl format, perhaps even the babl format with space, that would allow, for example, user A to save 8-bit sRGB indexed image RGB channel values along with the Alpha channel values, and user B to save 32f LCh values with no Alpha channel information, and etc. And then add code that "decodes" the palette color entries according to the babl format. Yes? No?
Best regards,
Elle

On 03/08/2019 04:44 PM, Elle Stone wrote:
Hi All,

In these two GIMP bug reports:

* Support for high bit depth RGB (and LCH?) color palettes for painting
https://gitlab.gnome.org/GNOME/gimp/issues/1328

* Add support for Swatchbooker's SBZ colour palette format
https://gitlab.gnome.org/GNOME/gimp/issues/2011

are discussions regarding either *converting* GIMP code to use SwatchBooker for high bit depth color palettes, or else *keeping* GIMP GPL palette code (updated to use floating point), and also adding support for importing/exporting SwatchBooker color palettes.
Here's the current git repository for SwatchBooker, maintained by 
Olivier Berten: https://github.com/olivierberten/SwatchBooker
Adding support for importing/exporting SwatchBooker color palettes seems 
like a really good idea for reasons given by "Christoph S" in bug #2011.
But converting all GIMP color palette code to use SwatchBooker maybe 
isn't such a good idea given the reality that maintainers of various 
free/libre projects do come and go as their lives place various demands 
on time and energy.
Anyway, I did write some barebones working code to convert GIMP color 
palette code from 8-bit integer to floating point. Details and the 
patches are in bug #1328.
My floating point palette code isn't finished. Well, it's sufficiently 
finished for my own needs. But I drastically simplified the palette code 
by removing everything except the core code for opening and saving a 
palette to/from a GPL file. Otherwise I'd still by trying to figure out 
which of the many the palette-related files/functions/variables does what.
If the GIMP team reaches a consensus to *keep* GIMP's GPL palette code 
and just update it to be floating point (and of course add support for 
importing/exporting SwatchBooker assets) - instead of *replacing* GIMP's 
GPL palette code with SwatchBooker - then I'd go ahead and try to add 
back into my working patch the various non-core palette functions that I 
removed to make it easier to figure out the core palette code.
Best regards,
Elle
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