[FFmpeg-user] Fluorescent White Balance Video Filters

Carl Zwanzig cpz at tuunq.com
Wed Apr 20 01:27:36 EEST 2022

On 4/19/2022 2:06 PM, Roger wrote:
> 5500 Kelvin - 6500 Kelvin - 0.21 CTO.cube
> 6500 Kelvin - 2800 Kelvin - 1.56 CTB.cube
> 6500 Kelvin - 5500 Kelvin - 0.21 CTB.cube
> Yea, horrendously named file names!

Not bad, actually :)

Harkens back to photography and motion pictures-
Color Temperature Blue (CTB) and Color Temperature Orange (CTO) gels were 
used to correct lights of one type to the 'color' of another and the number 
is the amount of correction*. Have a couple of tungsten desk lights in a 
scene with a bunch of windows? Wrap the bulbs with some CTB! (Or cover the 
windows with CTO, both of which come in 50' x 48" rolls and smaller sheets.) 
At one time, Rosco even made colored tubes for T-12 florescent lamps (about 
a 1/2 CTO IIRC).

*based on 3200 <-> 5500 kelvin



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