[FFmpeg-user] red-shift and blue-shift

[Michael Koch]

Am 04.03.2020 um 12:37 schrieb Paul B Mahol:
> On 3/4/20, Michael Koch <astroelectronic at t-online.de> wrote:
>> Hi,
>>
>> is there any known workaround for making a red-shift or a blue-shift? I
>> mean shifting the visible spectrum towards red or blue. In the middle of
>> the spectrum this can be realized by the "hue" filter, but at the end of
>> the spectrum I want a different behaviour. I want a shift instead of a
>> rotation. Colors at the end of the visible spectrum must be shifted to
>> (or from) black.
> Can't this be done with lut filters?

sure, that's possible but I haven't yet found a suitable software for 
creating this kind of LUT.

> Can you describe math behind this shifting more precisely?
> If possible in RGB.

I'll try to figure out the math.

Michael