[FFmpeg-user] Fluorescent White Balance Video Filters

[Michael Koch]

Am 19.04.2022 um 03:34 schrieb Roger:
> I'm not finding much about fixing video having incorrect white space, more
> specifically video with incorrect or forgotten fluorescent white balance
> setting during recording.
>
> I have a very old VHS recorded tape without a fluorescent white balance
> applied, and as such a green mask throughout the video.
>
> I started examing one frame of the video, luckily having distinct red, white,
> blue colors and was viewing the frame within RawTherapee and tinkering with
> white balance settings.  Low and behold, after applying the "Philips TL85
> fluorescent" (designated as "F10 - Philips TL85") white balance preset profile,
> the red/green/blue values all appeared exact!
>
> However, I cannot find this preset profile within RawTherapee installed files,
> nor do the *.pp3 sidecar files indicate specific values, hinting the values are
> either hard-coded or further buried within the installed system files, for
> which fgrep insensitive searching still fails to find the specifics of this
> filter.
>
> Question, what is the proper method of applying such a missing white balance
> fluorescent filter to a video file using ffmpeg?

I would do that with a color-look-up-table. The procedure is described 
step-by-step in chapter 2.27 and an easier simplified version is 
described in chapter 2.28 in my book:
http://www.astro-electronic.de/FFmpeg_Book.pdf

Michael