HI,
maybe these illustrations are helpful.
Luminance and Illuminance
https://www.konicaminolta.com/instruments/knowledge/light/concepts/04.html#section03
Instruments (concepts) to measure luminance or illuminance
https://www.konicaminolta.com/instruments/knowledge/light/instrumentation/04.html#section02
https://www.konicaminolta.com/instruments/knowledge/light/instrumentation/05.html
Best regards
Claas
Andreas Mock schrieb am 03.07.20 um 08:10:
Thank you for the clarification.
-----Ursprüngliche Nachricht-----
Von: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> Im
Auftrag von Graeme Gill
Gesendet: Freitag, 3. Juli 2020 08:08
An: argyllcms@xxxxxxxxxxxxx
Betreff: [argyllcms] Re: AW: Re: How to measure light without ambient
measurement head?
Andreas Mock wrote:
Hi,
How meaningful would it be to measure colors in emissive mode knowingcalculate a correction?
that measurment ist right and afterwards doing the same measurements
in emissive mode but with the diffusive reflective material in between to
it doesn't make a whole lot of sense unless you know the directional pattern
of the light source and have a known, fixed geometric relationship between
that light source and the instrument.
Emissive mode measures light coming from one direction (i.e. Luminance).
Ambient mode measures light with a cosine weighting for direction (i.e.
Illuminance).
So a particular calibration factor depends critically on the directional
characteristics of the light source and the relative location of the
instrument, so an emissive type measurement can substitute for an ambient
measurement only in very restricted circumstances.
Cheers,
Graeme Gill.
