[FFmpeg-user] Saturation adjustment only in some channels

[Clément Bœsch]

On Wed, Jan 01, 2014 at 08:39:20AM -0500, Martin Cracauer wrote:
> Stefano Sabatini wrote on Wed, Jan 01, 2014 at 01:21:07PM +0100: 
> > On date Tuesday 2013-12-31 15:24:16 -0500, Martin Cracauer wrote:
> > > I am doing color corrections on a video.  Used gimp to find the
> > > correction adjustments.
> > > 
> > > I have two difficulties:
> > > 
> > > 1) I need to apply saturation only to cyan (leave red alone). This
> > >    isn't directly supported by the hue filter.
> > > 
> > > 2) how do I clip a color? (the equivalent of using gimp color levels
> > >    and moving left or right slider, or in color curves move one end of
> > >    the curve on the x axis) I think it works reasonably fine but just
> > >    pushing the highs of the color, can somebody confirm that.
> > > 
> > > In general, how do ffmpeg's colorbalance filter's ideas of low, mids
> > > and highs translate to color curves? How much overlap do they have?
> > 
> > colorbalance and colorchannelmixer filters may help.
> 
> Yes, that's what I'm using.  They don't allow you to mess with the
> saturation in some channels only, though, and colorbalance's semantics
> when it comes to how wide it considers "mids" are a bit unclear.
> 

See the curves filter: http://ffmpeg.org/ffmpeg-filters.html#curves-1

[...]

-- 
Clément B.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 490 bytes
Desc: not available
URL: <http://ffmpeg.org/pipermail/ffmpeg-user/attachments/20140102/0825b4c2/attachment.asc>