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

[Michael Koch]

Am 11.03.2019 um 09:01 schrieb Gerardo Ballabio:
> Ok, thank you Michael. I'll try haldclut then. This means I have to do
> some research into Gimp too...

For the described workflow you can also use any other graphics program, 
if it can read and write uncompressed or lossless compressed images 
(like BMP or PNG). It doesn't work with lossy JPG compression.
In your example, begin with a high gamma correction.

Michael