[argyllcms] Re: AW: Re: AW: Re: AW: Re: How to measure light without ambient measurement head?

  • From: Boris Boev <boev.boris@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Thu, 9 Jul 2020 13:29:10 +0300

Big thanks for all the answers.
Thank you for such detailed advice, you really helped me =)

Best regards

Boris Boev


пт, 3 июл. 2020 г. в 09:37, Andreas Mock <andreas.mock@xxxxxx>:

Oh, that's sounds interesting.
Thank you for the pointers.

Regards
Andreas

-----Ursprüngliche Nachricht-----
Von: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> Im
Auftrag von Claas Bickeböller
Gesendet: Freitag, 3. Juli 2020 08:34
An: argyllcms@xxxxxxxxxxxxx
Betreff: [argyllcms] Re: AW: Re: AW: Re: How to measure light without
ambient measurement head?

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 knowing
that measurment ist right and afterwards doing the same measurements
in emissive mode but with the diffusive reflective material in
between to
calculate a correction?

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.








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