Re: MS Color Control Applet
Re: MS Color Control Applet
- Subject: Re: MS Color Control Applet
- From: Ken Fleisher <email@hidden>
- Date: Mon, 10 Jul 2006 23:33:58 -0400
On Jul 10, 2006, at 9:52 PM, Graeme Gill wrote:
If the machinery didn't work particularly well, then it's a problem
for print profiles too.
Actually, the situation that Chris Murphy was describing applies only
to display profiles. Here's a summary of why:
The mechanisms of chromatic adaptation can be broken down into two
general categories--sensory and cognitive. The sensory mechanisms
operate automatically in response to a stimulus, such as the gain
control that occurs in the retina. Cognitive mechanisms, on the other
hand, rely on the observer's perception of the scene. For example, we
know what "white" should be, so we are able to discount the illuminant.
This type of adaptation can fail, or more accurately it can produce
varied results, if the observer's perception of the scene is not
accurate.
A hard-copy image is perceived as an object that is illuminated by some
illuminant. Therefore both the sensory mechanisms that respond to a
stimulus and the cognitive mechanisms that discount the color of the
illuminant are active. However, a soft-copy image is not easily
perceived as an object that is illuminated by an illuminant. The result
of this is that only the sensory mechanisms are active resulting in an
incomplete chromatic adaptation. Note that this has nothing to do with
the length of time for adaptation. You can look at the monitor for
hours and still you will only achieve an incomplete adaptation due to
the nature of viewing a display.
Source: M. D. Fairchild, "Chromatic Adaptation to Image Displays",
TAGA Proc., Vol. 2, 803-823, Rochester, (1992)
--
Ken Fleisher
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