Quote:Originally Posted by heyskip
Ok, so even though I've been trying to educate myself on this, I'm now thoroughly confused.
If I set MadTPG to RGB 0-255 -> Nvidia to RGB 0-255 -> DVDO Duo to output YCbCr4:4:4 . This should work correctly?
If I set MadTPG to RGB 0-255 -> Nvidia to YCbCr4:4:4 -> DVDO Duo to output YCbCr4:4:4 . This should also work correctly but has the GPU doing the conversion (not desirable)
That's right, both configurations can be used for profiling but the first is preferred to avoid any scaling at the video card.
Quote:With the eecolour box after the Duo is it seeing 16-235 or 0-255 levels?
The eecolor sees all levels but 0-15 are below black and 236-254 are above white (255 is sync) in this configuration.
Quote:I thought YCbCr444 was limited to 16-235 and to avoid errors this would have to be maintained throughout the chain. Is this where I am going wrong.
No, Y'CC only sets black at 16 and white at 235, the other levels are still allowed. If in the above flow (Nvidia to RGB 0-255) you playback material with madVR set to 16-235 you will preserve btb and wtw through the system.
Quote:Originally Posted by madshi
All of the above just decides what your HTPC outputs. What the DVDO Duo and the eeColor box do with that, I cannot answer. Maybe someone else can.
The eecolor does not do any scaling, that's why after you profile you must use the -et -Et switches to scale the results into the 16-235 range if you want to use it for YCC playback. That scaling has to be done no matter what your profiling flow looks like.
Quote:Originally Posted by DrFaxe
the graphics card output discussion brings up some questions on my side too.
All my video devices are set to YCbCr444 and TV input to limited. Video chain is: source -> HDMI matrix -> eeColor -> TV
As a pattern generator I use the Intel HD3000 graphics card of my computer.
According to Zoyd and madshi the most accurate setup for the graphics card is RGB 0-255.
To verify if the graphics card out matches to my BD player using HCFR, I have to set the pattern generator of HCFR to 16-235. Doing this I compare RGB 16-235 with YCbCr444.
Will this be valid? As this is no apple to apple comparison.
When using argyll for profiling and as a pattern generator I have to use the -E switch for dispread, that argyll scales to 16-235. So basicly the same question, will the profile performed with RGB 16-235 work for my video devices with YCbCr444?
Yes, as long as you have the black and white points set correctly in your profiling flow it doesn't matter how many conversions are done and where. The results are always scaled to right range for use in the eecolor. You still have to verify if Y'CC playback from your primary source (BD for example) matches colorimetrically the RGB (or Y'CC) output of your video card using test patterns but that's a different issue.