[FFmpeg-devel] [libav-devel] [RFC] M-bit to N-bit YUV conversions

Michael Niedermayer michaelni at gmx.at
Thu Aug 25 07:07:41 CEST 2011

On Thu, Aug 25, 2011 at 06:34:03AM +0200, Michael Niedermayer wrote:
> >
> > Dither is all just because of ordered dither and I don't feel it's
> > worth looking into. I've been planning to replace it with
> > Atkinson-style dither (that's like f-s, which x264 uses) so let's just
> > work towards that and be done with it.
> I suggest a double blind comparission of a video (not still image)
> of them.
> I did it 5? years ago (not double blind) but FS on 8->4bit or so
> just flickered terribly compared to ordered dither.
> IMHO if one can see any difference between a FS type dither and
> ordered on 8->10 at all it wont be in FS favor.
that of course should have meant 10->8

> The situation may be different once it hits an encoder and certainly
> is different for still images where FS is better
> also ordered is faster, which when they look indistinguishable is
> also something to consider
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The bravest are surely those who have the clearest vision
of what is before them, glory and danger alike, and yet
notwithstanding go out to meet it. -- Thucydides
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