[argyllcms] Re: Feature request (and an implied question)
- From: Ben Goren <ben@xxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 26 Jul 2010 20:28:57 -0700
On 2010 Jul 26, at 5:16 PM, Matthieu DUBAIL wrote:
> I'm pretty sure that the problem with EV or Guide Number calculation here
> (apart from proper calibration constant) is that you need to know the
> distance of the light source.
Um -- I probably could have been more specific.
I'm not looking for an absolute measurement of a light source, but for a
measurement of the light levels reaching the measuring device. Think of
Argyll's option to check ambient lighting conditions versus measuring the
brightness of a display.
Both the light meter and the spectrophotometer have ambient metering modes; I'm
just looking to compare the two. (And, in experiments yesterday and today, I've
already had a lot of success. Adjusting the incident / ambient mode readings
also ``by-the-way'' brought those in line with the spot / reflective readings,
which also matched a camera's built-in meter. And it was only a quarter-stop of
adjustment needed, reasonably consistent across a wide range of light values,
so I'm pretty confident that it's a not-insane thing to do.)
Cheers,
b&
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