[PD] pix_freeframe
chris clepper
cgclepper at gmail.com
Wed Aug 30 17:51:48 CEST 2006
On 8/30/06, Yves Degoyon <ydegoyon at free.fr> wrote:
>
> ola,
>
> >
> >
> > i would also be interested in which context "RGBA" is twice as heavy
> > as "YUV" (with respect to Gem/pdp)
> >
> it's as simple as have shown dumb+dumber :
>
> in RGBA format, a pixel is represented by 4x(data size)
> in YUV planar 4:2:2 format, it is represented by :
> 1Y + 1/4*U +1/4*V = 1,5*(data size )
Technically that is 4:2:0. ;)
4:2:2 would be represent as 1Y + 1/2U + 1/2V in your notation. That is 16
bits per pixel or two in the 32bit space required for RGBA.
of course, loops are much faster with YUV 4:2:2
Just about everything related to video is faster with YUV processing.
That's why both PDP and GEM have full YUV chains right?
cgc
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