What an interesting name! On Wed, Jun 7, 2023 at 8:05 PM Andrew Randrianasulu via Cin < [email protected]> wrote:
> Found this tidbit > > > http://psychtoolbox.org/news.html > > in 3.0.18 beta > > 16 bit native (effective 12 bit) framebuffer support for Linux with AMD > Polaris and later. > > ==== > > This commit switches PsychImaging() to only expose 16 bpc framebuffers on > such Linux + X11 + AMD Polaris+ + amdvlk + Linux 5.14 systems, but then at > much better reliability and performance than our old dead code. > > It allows to get up to 12 bpc per color-channel color output, ie. 4096 > intensity levels for red, green, blue, grayscale/luminance and a total of > 64 billion shades of color, either on suitable 12 bpc capable high-end > displays, or via spatial dithering by the gpu on the more common 10 bpc > capable displays or even - at a lower quality - standard 8 bpc capable > displays. > > This makes Linux the first operating system to my knowledge to support > this color precision on out of the box on commodity graphics hardware and > displays, natively at full performance without any compromise in timing > precision or reliability. > > Basic testing has been performed with a CRS ColorCal-2 on a HDR-10 10 bpc > capable monitor and on a MacBookPro 2017 Retina display under Linux, with > AMD RavenRidge and Polaris. > > > ==== > > > test apps apparently even include gstreamer-based movie player (never > thought I'll find HDR player in medical software ...) > > > http://psychtoolbox.org/docs/PsychHDR > > > http://psychtoolbox.org/docs/PlayMoviesDemo > > > === > > If the optional flag ‘hdr’ is specified as non-zero, then the demo > expects the onscreen window to display on a HDR-10 capable display device > and system, and tries to switch to HDR mode. If the operating system+gpu > driver+gpu+display combo does not support HDR, the demo will abort with > an error. Otherwise it will expect the movies to be HDR-10 encoded and > try to display them appropriately. A flag of 1 does just that. A flag of 2 > will > manually force the assumed EOTF of movies to be of type PQ, iow. assume > the movie > is a HDR-10 movie in typical Perceptual Quantizer encoding. This is useful > if you > want to play back HDR content on a system with a [GStreamer > <http://psychtoolbox.org/docs/GStreamer>](GStreamer) > <http://psychtoolbox.org/docs/%28GStreamer%29> version older than > 1.18.0 installed, where [GStreamer > <http://psychtoolbox.org/docs/GStreamer>](GStreamer) > <http://psychtoolbox.org/docs/%28GStreamer%29> is not fully HDR capable, > but this hack may > get you limping along. Another restriction would be lack of returned HDR > metadata, > so if your HDR display expects that, you will not get the best possible > quality. > Upgrading to [GStreamer <http://psychtoolbox.org/docs/GStreamer>] > (GStreamer) <http://psychtoolbox.org/docs/%28GStreamer%29> 1.18 or later > is advised for HDR playback. > A flag of 3 or 4 will use an alternative HDR display method only available > on > Linux/X11, with 4 applying the same hack to cope with older [GStreamer > <http://psychtoolbox.org/docs/GStreamer>](GStreamer) > <http://psychtoolbox.org/docs/%28GStreamer%29> versions > as a setting of 2. > > > ==== > > > happy psyching! (???) > -- > Cin mailing list > [email protected] > https://lists.cinelerra-gg.org/mailman/listinfo/cin >
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