[FFmpeg-user] Fluorescent White Balance Video Filters

[Paul B Mahol]

On Tue, Apr 19, 2022 at 3:34 AM Roger <rogerx.oss at gmail.com> wrote:

> 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?
>

You could try colorcorrect filter. But note that it operates by default in
YUV colorspace.
While other software probably use Lab colorspace.


>
> I'm surprised there's so little mentioned via a Google search, as users
> are
> always mucking-up the white balance settings while video recording or
> taking
> photos, unless using a color/gray card.
>
>
> Roger
>
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