On Wed, May 22, 2013 at 6:08 PM, Joakim Plate <elupus@xxxxxxx> wrote: >> 2013/5/20 Daniel Vetter <daniel <at> ffwll.ch> >> Yeah, this is a feature. HDMI has (for oddball backwards compat with >> analog TV signals) a special mode which reduces the useable RGB value >> range by chopping off about 10% at the bottom and top end. This results in >> light colors getting brighter and dark colors getting darker. >> The above mentioned commit tries (to the best of our knowledge) to >> auto-set the option which most likely fits what the hdmi sink will do with >> the color data. You can either fix this up in the hdmi sink with the >> on-screen menu or by manually setting the "RBG Broadcast" property for the >> relevant hdmi connector to the setting you want. >> Cheers, Daniel-- >> Daniel Vetter >> Software Engineer, Intel Corporation+41 (0) 79 365 57 48 - > http://blog.ffwll.ch >> > > Does this mean the system is doing RGB full range to limited range > compression on the raw RGB data it receives from an application? > > Ie a video player that want to be able to handle blacker than black > properly will need to force the GPU into fullrange output to avoid > the driver internal compression of the signal and handle that itself? At least on the display I've seen limited range indeed seems to indeed clamp and full white/black. But ofc if your media player already outputs limited range, then you need to disable the gpu side ranger compression. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
