[argyllcms] AW: Re: How to measure light without ambient measurement head?
- From: "Andreas Mock" <andreas.mock@xxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Fri, 3 Jul 2020 07:55:52 +0200
Hi all,
I'm following this thread out of interest.
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?
Regards
Andreas
-----Ursprüngliche Nachricht-----
Von: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> Im
Auftrag von Graeme Gill
Gesendet: Freitag, 3. Juli 2020 02:24
An: argyllcms@xxxxxxxxxxxxx
Betreff: [argyllcms] Re: How to measure light without ambient measurement
head?
Boris Boev wrote:
Hi,
Is there a way to measure light with Agryll CMS, for example using
`spot` measure function?
you can do this fairly easily using a diffusive reflective material that has
a flat spectral response.
Expanded polystyrene foam or Tyvek is typically a good choice. You can check
how spectrally flat the material is using the instruments reflective mode.
To measure ambient you then reflect the light at 45 degrees into the
instrument in emissive mode.
How correct these measurements are?
If the material is spectrally flat, the relative response will be accurate.
The absolute units are uncontrolled though.
I guess if you assume the reflector has a uniform diffusive response and you
have measured its reflectivity, then it might be possible to calculate the
correction factor, but off hand I'm not sure how to do that.
Cheers,
Graeme Gill.
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