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

Phil Rhodes phil_rhodes at rocketmail.com
Wed Mar 4 14:19:33 EET 2020

I suspect you could do this with a lookup table; consider the lut3d filter. How you'd build the lookup table would be another matter.


On Wednesday, 4 March 2020, 12:05:16 GMT, Michael Koch <astroelectronic at t-online.de> wrote: 

Am 04.03.2020 um 12:44 schrieb Mark Filipak:
> On 03/04/2020 05:52 AM, Michael Koch 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.
>> Michael
> Hey, Michael, (seriously this time), can't you diddle luminance at the 
> same time as hue?

As far as I know, there is no filter for decreasing the luminance as a 
function of hue.
Although a complicated workaround with "geq" filter might be possible. 
I'll try to figure it out.


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