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?
Thanks,
Michael
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