Re: YUV format

YUV12 saves the chrominance planes at 1/4 the resolution of the luminance
plane right? because the eye is less sensitive to colour than shade.

Instead of reducing the colour resolution, why not simply quantize the
colour information more heavily. This way the encoder could be more flexible
about how much colour information is kept (hopefully reducing blocky
artifacts in areas where the colour changes abruptly).

Also, there would be no need for extra resizing operations to convert RGB ->
YUV.

Dust

----- Original Message -----
From: "Ed Okerson" <[email protected]>
To: <[email protected]>
Sent: Friday, December 27, 2002 10:05 AM
Subject: Re: [tarkin-dev] YUV format


> Well, It seems I have messed something up.  If I use the venus cubes ppm
> files, everything seems to work fine.  If I push them through ppm2y4m to
> create a YU4MPEG2 file, then try to encode that it does not work properly.
> I must not have done the YUV conversions properly.  I will get back on
> that tomorrow and see if I can figure out what I did wrong.
>
> Ed Okerson
>
>
> --- >8 ----
> List archives:  http://www.xiph.org/archives/
> Ogg project homepage: http://www.xiph.org/ogg/
> To unsubscribe from this list, send a message to
'[email protected]'
> containing only the word 'unsubscribe' in the body.  No subject is needed.
> Unsubscribe messages sent to the list will be ignored/filtered.
>

--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to '[email protected]'
containing only the word 'unsubscribe' in the body.  No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.