[FFmpeg-user] very strong contrast enhancement

Paul B Mahol onemda at gmail.com
Mon Feb 25 16:58:14 EET 2019

On 2/25/19, Michael Koch <astroelectronic at t-online.de> wrote:
> Which is the recommended filter for a very strong contrast enhancement,
> up to a factor of 10?
> The eq=contrast=... filter allows only a maximum of 2. Could this be
> changed to allow higher values?
> As a workaround I'm using 3 or 4 cascaded eq filters.

Is your source RGB or YUV?
There are missing filters for gamma/saturation/hue/contrast in RGB.

> I did also try  geq=r='5*r(X,Y)':g='5*g(X,Y)':b='5*b(X,Y)'
> but this filter is slow and it seems there is no limiter when an
> overflow occurs.
> Are there any other filters for strong contrast enhancement?
> Thanks,
> Michael
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