[FFmpeg-user] Fluorescent White Balance Video Filters

[Michael Koch]

Am 19.04.2022 um 20:38 schrieb 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.

Not multiple functionality. Only one thing is called stupid.

Michael