Originally, this question was titled: How to detemine native color temperature of a sensor?
For questions about warming filters and color filters in general, leading answers indicate that for optimal signal-to-noise ratio it would be wise to adjust colors optically. But for adjusting, how would one first measure the target "native" color temperature where white color causes equal signal in different color channels?
I assumed it's somewhere close to daylight, but this unadjusted shot where @Karel demonstrated UniWB seems to be shot in daylight and has a strong domination in green and blue channels:
My camera (like many others) does not have UniWB, so I'd prefer a solution that does not take advantage of UniWB setting.
Thinking a bit more, it's actually not the color temperature that is important. The end result I'm interested in is how to choose the filter to use for achieving balanced signal in all color channels? Perhaps I don't even need to know the color temperature, I'm just used to see filter specifications citing color temperature conversions.
I see the answer would depend on
- characteristics of sensor
- current lighting
The sensor is the same, as long as I do not switch bodies. The lighting will be different in different situations, but there are common scenarios - daylight/flash, cloudy, tungsten.
So, how do I choose filters for my sensor in those common scenarios? I hope there's a better way than just buying a bunch and trying them all out.