[FFmpeg-user] How to correct dark video with bright background

Gerardo Ballabio gerardo.ballabio at gmail.com
Mon Mar 11 10:01:58 EET 2019

Ok, thank you Michael. I'll try haldclut then. This means I have to do
some research into Gimp too...


Il giorno dom 10 mar 2019 alle ore 22:20 Michael Koch
<astroelectronic at t-online.de> ha scritto:
> Am 10.03.2019 um 22:05 schrieb Michael Koch:
> > Am 10.03.2019 um 21:33 schrieb Gerardo Ballabio:
> >> Thank you Michael -- but that means I still have to find good values
> >> of brightness, contrast, gamma, saturation and hue to use with Gimp.
> >> When I've done that, then couldn't I just apply the same values in
> >> ffmpeg using the "eq" filter?
> >
> > That won't work because in most cases the values for brightness,
> > contrast, saturation and so on don't have the same units in different
> > programs.
> Also you can't be sure that different programs apply the filters in the
> same order. Applying brightness before contrast doesn't give the same
> result as contrast before brightness. It's an addition and a
> multiplication, and it's important what's done first.
> Michael
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