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Old 8th January 2019, 21:51   #54169  |  Link
huhn
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Join Date: Oct 2012
Posts: 7,903
Quote:
Originally Posted by tp4tissue View Post
How does changing the Sent meta data from rec2020 to dci-p3 change the image, if at all.
if your screen can do bt 2020 natively it would do something if it is close to DCI P3 it should do nothing at all.
Quote:
How does changing the peak nit part of the meta data affect the image..
Quote:
If, there is a change at all, what does the tv DO with that meta data, does it pop into different modes.
who knows literally what ever they want. HDR tonemapping doesn'T have a real one way is correct spec.
the difference should be the image dynamic until it hits it max brightness then it does what ever it wants.

as i said before there is no clear answer.
Quote:
Originally Posted by SamuriHL View Post
Chroma still needs to be scaled. It's not about resolution. Chroma data is stored in 4:2:0 and needs to be scaled to 4:4:4 or 4:2:2 depending on what you're sending to your display.
and in madVR case it will always be scaled to 4.4:4 and only RGB is send to the GPU driver that's why sending 4:2:2 or 4:2:0 is bad for the applied dithering and chroma quality the driver has to RGB -YCbCr convert which alone creates floatpoint numbers downsacle the chroma which again results in float point numbers. chroma sub sampling is just storing chroma in a lower resolution than luma so it's pretty much resolution.

and as a fun fact 8 bit RGB has more BPP as 10 bit YCbCr 4:2:2.

chroma is for most scenes not important up to a point that bilinear will be enough but as soon as an image get's chroma heavy or even based (red text on black background as an example) it shows significant differences especially on BDs where you are now literal using an good scaler on SD.

Last edited by huhn; 8th January 2019 at 21:55.
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