[FFmpeg-user] Fluorescent White Balance Video Filters

[Paul B Mahol]

On Tue, Apr 19, 2022 at 8:25 PM Michael Koch <astroelectronic at t-online.de>
wrote:

> 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



Your book multiple times calls multiple functionality in FFmpeg stupid.


>
>
> Michael
>
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