[MPlayer-users] Greyscale "tricks"

[Meino Christian Cramer]

From: Jan Knutar <jknutar at nic.fi>
Subject: Re: [MPlayer-users] Greyscale "tricks"
Date: Thu, 15 Jul 2004 07:14:41 +0300

> On Thursday 15 July 2004 07:00, Meino Christian Cramer wrote:
> >   My impression was, that there is no kind of colorspace which offers
> >   only one channel for brightness and not only have set the rest two
> >   channels set constantly set to zero but simply does not store these
> >   bunch of zeroes to the file.
> 
> Even when using huffyuv, which is a pretty basic form of /lossless/ 
> compression, the zeroes would get compressed to occupy practically zero 
> space :)
> 
> >   hrrrmmm...my intention was to _avoid_ noise and to raise the PSNR as
> >   high as possible...;)
> >   Or do I understand something wrong here.
> 
> The whole bit about denoising colour only when doing grayscale encoding 
> was a bit silly. The lavc option gray strips out all colour, so 
> anything you do to mangle colour is 'lost'.
> 
> >   Currently I am fighting agains blcok artefacts and against another
> >   effect, from which I dont know, whether it is a bug (mine or one of
> >   mencoder/mplayer) or whether it is a feature:
> 
> What -lavcopts are you using?

  does my mail with the exerpt from my script arrive the mailing list
  ???


> 
> >   When adjusting -- for example -- the volume I get "bars" as an osd
> >   display. When finished adjsuting, this bar remains blurred on the
> >   screen and will be "taken" by the underlaying movie -- be more and
> >   more blurred.
> 
> This sounds more like a bug... Same thing when playing with -double?
> 
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