Hi Peter, ISO 3664:2009 requires a measurement range from 300nm to (AFAIR) 830nm. This is way beyond the range needed for colour measurements. As the instruments you are referring to are mainly used to measure reflection values in the visible wavelength range (AKA colour) it would add up a lot of overhead (= costs) to also comply to ISO 3664. But our Konica Minolta FD-7 as well as our MYIRO-1 measure light starting from 360nm. As typical light sources used for colour appraisal in graphic arts do not have significant energy below 360nm (neither fluorescent tubes nor LED) this is perfectly sufficient to get a very good idea about the quality of your viewing environment. On top you can even use the measured light spectrum to calculate profiles for exactly this condition (instead for theoretical D50). In case you are interested in their other features feel free to contact me off-list. Best regards Claas
Peter Miles via colorsync-users <mailto:colorsync-users@lists.apple.com> 12. Dezember 2024 um 07:16 Hi List members. I have been wondering why the spectrometers that we use in colour management have not begun to include some UV measurement, given ISO3664:2009 requires lighting with specified amounts of it. Or in the case of the upcoming P3/P4 viewing condition, its absence.
I use ours (XRite) to measure CRI/TM-30 of room lighting, and to check light modifiers used in our photo studio as they age, and that’s great. But I can’t use it for to check if lighting is ISO 3664 compliant. And that seems strange, given these spectrometers target market.
Would adding UV sensitivity make spectrometers too expensive for not enough added value? Or are there other cans of other worms that make it not practical?
I’m hoping those in the know could shed some light on this.
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