[visionlist] Low cost photometer/colorimeter
mark.mccourt at ndsu.edu
Thu Mar 23 13:55:03 -04 2017
Right, invariant with distance provided that the source or surface in question completely fills the aperture of the photometer.
From: visionlist [mailto:visionlist-bounces at visionscience.com] On Behalf Of Jeff Mulligan
Sent: Thursday, March 23, 2017 11:07 AM
To: visionlist at visionscience.com
Subject: Re: [visionlist] Low cost photometer/colorimeter
On 3/23/17 8:13 AM, Georgeson, Mark A wrote:
> Comment: since luminance is invariant with distance, it shouldn't
> matter in principle what distance the meter is at.
insert "for extended sources"---------------------^
True enough for full-field displays, but maybe not for single pixels.
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