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Forum: Flashes, Lighting, and Studio
02-14-2019, 06:23 AM
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Yeah, sure, but I think this particular thread is focused on making images look right on the monitor, not on real vs monitor comparison techniques.
That's what I meant.
I'd say they'd fall reasonably close together.
A dual-illuminant profile (cf. the OP's post) won't do all lighting situations justice anyhow, so I think the sun on a cloudless day is as good as it needs to be with respect to a perfect Plankian 6500K blackbody, even given all the atmospheric absorption. I think the OP was interested in using the camera for photography, not as a scientific instrument. :)
Interesting information, though, kaseki, very interesting indeed.
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Forum: Flashes, Lighting, and Studio
02-13-2019, 12:10 AM
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Yes, but the OP was enquiring regarding dual-illuminant profiles and incandescent sources could well play the part for the low temperature component of the dual-illuminant profile.
Interesting. In my own experience, test shots of colour checkers with flash look remarkably similar to test shots done in daylight (white balancing may be required, depending on daylight conditions).
It is very well possible that I wasn't looking hard enough. I think it is fair to say though that most commonly occurring light sources differ far more significantly from each other than flash emitted light and daylight do.
I'd expect differences, given that 95 CRI does not mean that much in particular regarding perceptual differences (hence the efforts around R96a, CIECAM02, etc.).
Some LED panels would come closer than others, but I understand the respective CRI numbers would not be a very reliable indicator, meaning even a high scoring CRI source is not necessarily an actual high performer.
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Forum: Flashes, Lighting, and Studio
02-12-2019, 06:01 AM
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+1
Even better LED-based lighting solutions are typically inferior to incandescent lights or regular flash when it comes to spectrum smoothness.
Even relatively high CRI figures like >97 don't necessarily mean a lot as the lowest CRI bar is very low indeed, using patches with low saturation levels only.
There are indeed several CRI standards and even competing standards which are much more demanding on light sources than the low-bar version of CRI.
I would not base any profiles (dual-illuminant or not) on an LED light unless you want to specifically use them with this LED light. With all other light sources (including natural daylight) you will have to expect more or less significant problems due to the bumpy if not spiky LED spectra.
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