2015-09-28, 14:13
Mhh - now we have some confusion :-)
"Use limited Color Range" only changes the way kodi processes Color information. E.g. it cares that decoded NV12 surfaces are not upscaled to full rgb, but transformed to limited range rgb. Furtheremore it scales the GUI shader and Picture Viewer when presenting the GUI and the Pictures.
It has absolutely _no_ influence on the GPU setting, which is solely done by xrandr. It is also obviously clear - that scaling in kodi makes only sense when the display driver does not _scale_ by itself after that. That's why we force the GPU always to full range.
So with that being set there are only two use cases that make sense:
A) GPU Full Range (xrandr), Kodi "Use Limited" _not_ ticked, Dithering (8bit enabled), TV set to full range
B) GPU Full Range (xrandr), Kodi "Use Limited" _ticked_, Dithering (8bit is okay for banding in source material), TV set to Limited Range
Every other setting makes no sense for color scaling in our own hands.
If you really out of ever reason cannot avoid it to output GPU Limited range (xrandr), cause your TV acts stupid whatever or scales again when it gets full range (also possible). Then it is very important that you only let the scaling downwards happen once. Here I suggest GPU Limited range (xrandr), Kodi "Use Limited Range" _not_(!!!) ticked, Dithering 8 bit enabled. Then kodi will upscale and dither everything to 0..255 and the display driver will scale the range again to 16 .. 235.
"Use limited Color Range" only changes the way kodi processes Color information. E.g. it cares that decoded NV12 surfaces are not upscaled to full rgb, but transformed to limited range rgb. Furtheremore it scales the GUI shader and Picture Viewer when presenting the GUI and the Pictures.
It has absolutely _no_ influence on the GPU setting, which is solely done by xrandr. It is also obviously clear - that scaling in kodi makes only sense when the display driver does not _scale_ by itself after that. That's why we force the GPU always to full range.
So with that being set there are only two use cases that make sense:
A) GPU Full Range (xrandr), Kodi "Use Limited" _not_ ticked, Dithering (8bit enabled), TV set to full range
B) GPU Full Range (xrandr), Kodi "Use Limited" _ticked_, Dithering (8bit is okay for banding in source material), TV set to Limited Range
Every other setting makes no sense for color scaling in our own hands.
If you really out of ever reason cannot avoid it to output GPU Limited range (xrandr), cause your TV acts stupid whatever or scales again when it gets full range (also possible). Then it is very important that you only let the scaling downwards happen once. Here I suggest GPU Limited range (xrandr), Kodi "Use Limited Range" _not_(!!!) ticked, Dithering 8 bit enabled. Then kodi will upscale and dither everything to 0..255 and the display driver will scale the range again to 16 .. 235.
