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Re: CG243W problem with blacks? clipping?
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Re: CG243W problem with blacks? clipping?


  • Subject: Re: CG243W problem with blacks? clipping?
  • From: Marco Ugolini <email@hidden>
  • Date: Sat, 23 Jan 2010 09:54:32 -0800
  • Thread-topic: CG243W problem with blacks? clipping?

In a message dated 1/23/10 3:04 AM, Matthew Ward wrote:

> If the field of view of the measuring instrument was indeed 2 degrees
> from say 1cm away? It would be measuring colour from a somewhat small
> area. About 0.3 mm diameter or about a pixel.

I would find it hard to believe that 2-degree or 10-degree standard observer
measurements literally mean that the spectrophotometer only measures a
2-degree or 10-degree field of view from its head. It doesn't seem plausible
that the measurements would be based on just a width of roughly 1 pixel at 2
degrees, or about 5 pixels at 10 degrees.

Instead, I would presume it means that the measurements simulate the
colorimetric response of a 2- using the appropriate equations in ICC
colorimetry.

By the way, for reference, at 20 inches of distance (which I assume to be an
acceptably average viewing distance from a display), a 2-degree field of
view corresponds to a circle measuring 0.7 inches in diameter; for a
10-degree field of view, the diameter at that distance is 3.5 inches.

Marco Ugolini


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