Re: [Gimp-user] 10-bit display color depth support (30-bit, deep color)

[Liam R E Quin <liam holoweb net>]

On Sat, 2020-11-14 at 10:35 +0000, LKH via gimp-user-list wrote:
> Yes I have tried GIMP 2.99 on Linux with 30-bit depth enabled as
> verified with xdpyinfo and xwininfo. It does not display in 30-bit as
> far as I can tell. 

Make sure that you have a monitor that can handle 10-bit colour.

GIMP did use 30-bit visuals when i tried it in X; you must of course
have an image with bit depth 16 per channel or higher to experience it
:) The main problem i had was that gtk2 thoguht it was 24-bit colour
plus -bit alpha, so while the gimp image window was fine, the dialogue
boxes were partly transparent. It's a while since i tried (the monitor
here is only 8-bit) but gimp 2.99 is a better bet than gimp 2.10 for
this.
> Conceptually this is definitely not something that would just work
> without the developers going to some lengths to implement it,

Right.

How did you determine it wasn't working? With xdpyinfo? what did it
report?

See e.g.
https://gitlab.gnome.org/GNOME/gimp/-/issues/3859



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