colour management and hdr mostly intersect with three areas of video: pixel formats, yuv <-> rgb conversions and gamma transfer functions. For example xdg_pixformat_yuv121010 xdg_subspace_bt2020 xdg_gamma_bt2020
just off the top of my head, these arent intended to be actual suggestions On Thu, 28 Mar 2024 at 18:57, salsaman <salsa...@gmail.com> wrote: > In addition, I am not sure if there are xdg standards for audio, but I > would suggest video and follow similar hierarchies, and that both could be > classed under a more generic xdg multimedia standard. > > > On Thu, 28 Mar 2024 at 18:48, salsaman <salsa...@gmail.com> wrote: > >> Hi, IMO hardware related would be more appropriate under display standards >> Video standards could be more software related, and provide common >> definitions, for example , allowing exchange of information between >> applications which produce or consume video frames or streams of frames. >> Some examples I can think of might be >> xdg_colorspace_RGB, >> xdg_colorspace_YUV >> >> xdg_pixfmt_RGB24 >> xdg_pixfmt_YUV420p >> etc >> >> xdg_gamma_linear >> xdg_gamma_sRGB >> >> xdg_video_width >> xdg_video_height >> >> I could provide a more full list, but I think if it goes along this >> route. the starting point has to be what are we setting out to achieve with >> the standards / definitions, and provide a range of speculative use cases. >> >> Gabriel (salsaman) >> >> >> On Thu, 28 Mar 2024 at 06:07, Pekka Paalanen < >> pekka.paala...@haloniitty.fi> wrote: >> >>> On Wed, 27 Mar 2024 11:45:00 -0300 >>> salsaman <salsa...@gmail.com> wrote: >>> >>> > ISTR that the xdg video standards were never defined, If you need any >>> > advice or assistance with this, I would be happy to act in an >>> > advisory capacity if that is called for. I have over 20 years >>> experience of >>> > developing Free Software video and have been an active participant in >>> > developing other video / effects standards. I have been a bit our of >>> the >>> > spotlight recently as I have been busy architecting and implementing >>> the >>> > core components of the upcoming next gen LiVES 4,0 video application >>> plus >>> > its accompanying state-of-the-art effects standard) >>> >>> Hi, >>> >>> what kind of video standards would that be? >>> >>> I'm wondering if it would have anything to do with Wayland color >>> management and HDR: >>> >>> https://gitlab.freedesktop.org/pq/color-and-hdr >>> >>> https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/183 >>> >>> https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/14 >>> >>> Would there need to be any XDG standards to support color managed HDR >>> desktops, or is the window system support enough? >>> >>> I have not much in my mind, but then I've been staring only at the >>> window system interactions, and haven't seen what else the desktop >>> ecosystem or applications might need. >>> >>> Recommended display calibration and measurement procedures maybe? >>> >>> Desktop viewing environment standards? >>> >>> Viewing environment measurement? >>> >>> They could be as straightforward as referring to a freely available >>> ITU-R or SMPTE papers or others, if there are suitable ones. >>> >>> >>> Thanks, >>> pq >>> >>
