> -----Original Message----- > From: ffmpeg-devel [mailto:ffmpeg-devel-boun...@ffmpeg.org] On Behalf > Of Harish Krupo > Sent: Friday, February 08, 2019 4:17 PM > To: FFmpeg development discussions and patches <ffmpeg- > de...@ffmpeg.org> > Cc: Strasser, Kevin <kevin.stras...@intel.com>; Palli, Tapani > <tapani.pa...@intel.com>; Sharma, Shashank <shashank.sha...@intel.com> > Subject: [FFmpeg-devel] SDR->HDR tone mapping algorithm? > > Hello, > > We are in the process of implementing HDR rendering support in the > Weston display compositor [1] (HDR discussion here [2]). When HDR > and SDR surfaces like a video buffer and a subtitle buffer are presented > together, the composition would take place as follows: > - If the display does not support HDR metadata: > in-coming HDR surfaces would be tone mapped using opengl to SDR and > blended with the other SDR surfaces. We are currently using the Hable > operator for tone mapping. > - If the display supports setting HDR metadata: > SDR surfaces would be tone mapped to HDR and blended with HDR surfaces. > > The literature available for SDR->HDR tone mapping varies from simple > linear expansion of luminance to CNN based approaches. We wanted to > know > your recommendations for an acceptable algorithm for SDR->HDR tone > mapping. >
In ITU-R BT.2390 (https://www.itu.int/pub/R-REP-BT.2390) section 10, there is a discussion on the approach to preserve the look of the SDR content when shown on an HDR display. BTW, just curious why the HLG video/display is not considered in the wayland compositor, thanks. > Any help is greatly appreciated! > > [1] https://gitlab.freedesktop.org/wayland/weston > [2] https://lists.freedesktop.org/archives/wayland-devel/2019- > January/039809.html > > Thank you > Regards > Harish Krupo > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
