[MPlayer-users] gamma ajustment with mencoder

[D Richard Felker III]

On Tue, Sep 10, 2002 at 11:16:35AM -0700, Christian Lambert wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> 
> I'm looking for a way to ajust the gamma while encoding
> using mencoder.   I've found the npp filter called "al"
> which does seem to help but I would like to be able to maybe
> boost it a bit more.  I seein the help that you can control
> the range but I can't seem to find the right syntax to use
> to reduce the range from let's say 8 to 240. 
> 
> al      autolevels                              automatic brightness / contrast
>                         f       fullyrange      stretch luminance to (0..255)
> 
> I tried various combination like shown below, but I can't find the
> right syntax it expects.
> 
> -npp f:8:255
> -npp f=8..255
> -npp f:8..255
> -npp f:8,255
> 
> Is someone working on a gamma -vop filter?  I think that would be
> a good idea if this -npp is not the same as gamma ajustment.  I'm not
> sure if it can do the same thing or not. 

-vop eq can control brightness/contrast. Not quite the same as gamma,
but you might be able to use it instead.

Rich