Dears, Thanks for your suggestion, sorry for this late answer...
Yes, 16 (5+6+5)bits instead of 18 (6+6+6)bits seem acceptable! Unfortunately, this don't work: I think I have an Endianness problem. For who's interested, I've posted some photos of resulted screen here: DefaultDepth 16 Raspberry-PI LXDE with ``temple.jpg'' as background, https://f-hauri.ch/vrac/G121XN01/rpi-G121XN01-lxde_temple-16.jpg Gimp showing ``temple.jpg'' editing ``Colors Levels'' ouput -> 0 - 63 https://f-hauri.ch/vrac/G121XN01/rpi-G121XN01-gimp-16.jpg DefaultDepth 24 Raspberry-PI LXDE with ``temple.jpg'' as background, https://f-hauri.ch/vrac/G121XN01/rpi-G121XN01-lxde_temple-24.jpg Gimp showing ``temple.jpg'' editing ``Colors Levels'' ouput -> 0 - 63 https://f-hauri.ch/vrac/G121XN01/rpi-G121XN01-gimp-24.jpg Nota: Due to antialias, text are very hard to read. Le Wed, Oct 13, 2021 at 07:01:17PM -0400, Chris Sorenson a écrit : > > Message: 1 > > Date: Wed, 13 Oct 2021 09:32:20 +0200 > > From: Felix Hauri > > ... > > Working on an industrial PC, I've restaured a strange 18bits LCD display > > G121XN01 V.0 (without touch panel.) > > > > https://www.panelook.com/G121XN01%20V0_AUO_12.1_LCM_parameter_831.html > > > > They are able to display 262K colors ( 6-bit Red, 6-bit Green, 6-bit Blue ) > >... > > Wouldn't this be as simple as setting DefaultDepth 18 in xinitrc? Best > way to do this is copy the system xinitrc (or whatever it's a symbolic > link to) to ~/.xinitrc and do any experimenting from there. > > If that doesn't work, for whatever reason X might need multiples of 8 > bits, I don't actually know, but DefaultDepth 16 should work -- Félix Hauri - <fe...@f-hauri.ch> - http://www.f-hauri.ch