[FFmpeg-user] very strong contrast enhancement

Michael Koch astroelectronic at t-online.de
Mon Feb 25 16:34:20 EET 2019

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.

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?


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