Re: Even more about monitors and gun control
Re: Even more about monitors and gun control
- Subject: Re: Even more about monitors and gun control
- From: email@hidden
- Date: Fri, 15 Jun 2001 12:24:55 EDT
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In a message dated 6/15/01 11:09:27 AM, email@hidden writes:
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I believe the Spyder has seven sensors for measurement and one sensor for
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detection of monitor refresh. Similarly, the Chroma4 has three sensors for
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measurement and one sensor refresh detection.
I can't tell you what happens internally; but when I look at a Chroma4 I see
three little transparent squares where the sensors should be; when I pry the
diffusor off a Spyder I see 9 similar little squares...
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As far as three versus seven, consider the nature of the problem. The whole
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purpose of a color sensor for
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monitor calibration is to measure monitor color the way the eye sees it.
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Ah, this would be the basis of my differing assumptions. I look at it in
terms of color detection, and assume that three filters (like the eye's three
cone types) are blind to a lot, and that more sensors is moving more in the
direction of a defraction spectro, with many bands. Now if the intent is
simply to build gamma curves for the three guns, then yes, a sensor tuned for
each monitor color should do the trick. But if the intention is to actually
distinguish whether the green phosphor is a bit more yellow, or a bit more
cyan, wouldn't extra sensors tuned to distinguish in between Blue and Green
or Red and Green add more detailed data to this process? So for simply
downloading curves to the video card, yes, three sensors, or even a single
luminance meter, should do the trick, but for defining the phosphor colors
for a matrix profile (or, if we dare consider it, taking readings throughout
the color space for a true 3d lookup table) would be improved by increased
data.
So the theoretical differences here would be your model where piecing
together more parts is likely to introduce more error, versus my model where
a ruler divided to eights is more detailed and accurate than one divided only
to thirds.
C. David Tobie
Design Cooperative
email@hidden