What pixel format to use? Ycbcr or rgb.. They look really different

413x · 3 Jun 2013 at 22:10

They look very different!

My gfx software tells me I have both options. I'm not sure what is the correct one to use?

Psycho Sonny · 4 Jun 2013 at 12:28

depends on the screen surely?

also tv's usually use limited profile unless connected through the "pc" input.

i tend to use RGB limited as mine is connected to a tv and not a monitor.

413x · 4 Jun 2013 at 12:54

Psycho Sonny said:
depends on the screen surely?

also tv's usually use limited profile unless connected through the "pc" input.

i tend to use RGB limited as mine is connected to a tv and not a monitor.

It's a panny plasma gt30
Gfx software says it supports limited rgb, full rgb and ycbcr 444 and 422

Psycho Sonny · 4 Jun 2013 at 15:27

al4x said:
It's a panny plasma gt30
Gfx software says it supports limited rgb, full rgb and ycbcr 444 and 422

limited rgb

lucid · 4 Jun 2013 at 15:37

It also depends on what media you are playing. PC graphics will require full range (0-255) because it doesn't reserve space for above white and below black data. Video should use the limited dynamic range (16-235) because 16 represents video black, and 235 represents video white.

For colour space, the media source should give a clue to the selection. DVDs and Blu-rays store their data in YCbCr. The actual format is 4:2:0 on disc but it is decoded to 4:2:2 at output from a player. YCbCr 444 represents Deep Colour Component. AFAIK there are no feature films encoded using Deep Colour. It's redundant for movie playback and also incorrect for accurate colour mapping. It's also worth noting that there's nothing in the spec for consumer DVD and consumer Blu-ray that actually allows for the use of Deep Colour encoding.

YCbCr444 and RGB444 both use a different Colour Space to YcbCr422. The effect of playing YCbCr422 data with a 444 Colour Space is that the colours will all be mapped slightly incorrectly and the Black and the White Points will both be wrong. The effect is slightly exaggerated colour and a picture that looks too dark and over-contrasty. It's not true to what the film should look like. Sony talked about releasing some games for the PS3 in a Deep Colour format. I don't know if they ever did. So, overall Deep Colour (A.K.A. xvYC) is just marketing BS until there's some games software that can make use of it.

Broken Hope · 4 Jun 2013 at 20:36

That TV doesn't support full RGB so pointless setting any software to that setting.

Psycho Sonny · 4 Jun 2013 at 21:57

as i said above limited RGB should be used for pretty much all tv's regardless of if they can accept other signals or not, because they only do limited through HDMI, connect through VGA then they accept full RGB on newer models, well thats how my GT50 works anyway.

i use mine on limited and the PQ is very very good.

413x · 4 Jun 2013 at 22:46

It's that a difference of opinion then?

I had read blu ray etc uses ycbcr

If that is the case is limited rgb not the wrong one to pick?
Does it make a difference if you are watching a blu ray via a pc?

Psycho Sonny · 4 Jun 2013 at 22:49

al4x said:
It's that a difference of opinion then?

I had read blu ray etc uses ycbcr

If that is the case is limited rgb not the wrong one to pick?
Does it make a difference if you are watching a blu ray via a pc?

the way i have seen it is my graphics card can output anything.

my tv only handles limited through hdmi.

therefore i choose limited.

it doesnt matter what blu ray does, or what your pc does, it depends on what your tv handles.

Rroff · 4 Jun 2013 at 22:50

Go with RGB or the closest setting (i.e. the limited RGB mentioned) unless you actually know when/why to use the other settings they will cause more problems than anything.