Which are the most critical primary colours postprocessing video

hello,

I was recently asked in an interview for video editor,
"Which are the two main colours of concern along the Kelvin scale?"
Green and Blue
or
Red and Green
or
Black and white.

I never came to a situation like the above before, and i was wondering
if anybody can give me an answer and why please.

I pressume this has to do with possible clipping or colour wavelengthes
that video cannot record properly ?

Any answers will be appreciated
Thanks

basilt wrote: …
"Which are the two main colours of concern along the Kelvin scale?"
…Black and white.
…

<wiseguy mode ON> black and white are no 'colors', esp. not on the K scale....

The answer to their question should probably be orange (salmon) and blue since they asked about two colors "along the Kelvin scale". Lower Kelvin shifts orange and higher Kelvin shifts blue.

If the question was more like the title of the thread "most import and primary colors), then I would say red/green/blue as visualized by a vector scope.

---> Jarrod

Thanks for your answer Jarrod.

When you say colours are shifting, do you mean i.e. Red becomes more orangish and blue more cyanish, loosing color information ?

I think there was also another answer in ther chart, i did not see that time, so possibly was O and B colours.

I thought about RGB on waveform but 1 answer was allowed so i just selected R+G thinking that these channels hold contrast info in photography...

anyway, thanks again

Yeah the Kelvin scale relates to colors associated with external lighting temperature.

As Jarrpd was saying there is like a range of colors that go from amber to yellow, to white to blue. Its exactly the same type of colors you would expect the sun and ambient light of the sky to contribute to a shot depending on the actual temperature and time of day.

Its measured in Kelvin where 0 degrees actually relates to the point where atoms stop moving (-460 F/-273 C). Where we are concerned the Kelvin scale relates to the temperature of sunlight just above the atmosphere. Thats why those numbers are quite astronomically large.

I get the impression Kelvin used in color work is more of an old school thing and probably isn't something we couldn't describe using standard HSL tools, however not as easily. There are plugins out there that emulate this kind of color scale. Kelvin by Tiffen is one. They can make this kind of thing easier.

However, many of us are just happy to bluff out way with common color grading techniques.