re: measuring density
re: measuring density
- Subject: re: measuring density
- From: "Ruud" <email@hidden>
- Date: Mon, 14 May 2001 23:50:24 +0200
On Thu, 10 May 2001 16:29:36 -0500, email@hidden wrote:
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When measuring density, the usual result is a number (for example 1.4).
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Does this measurement result have a label? In other words is the result
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referred to as points, or degrees, something else?
In short, no. A reflective densitometer is calibrated with a ceramic
tile which has a black and a white square on it. The values of the
squares are pre measured in the factory. I presume that the factory
calibration is based on a whitepoint and a pure black.
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If I measure with my
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tools and get a "status T" density is this different from other types of
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density values?
Yes, status T is the American standard and status E is the European standard.
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How about the scale - is it a linear scale or a log scale?
Density is the log ratio between transmitted and reflected light. eg.
100% light transmitted on a 50% reflective object= 100/50=2 log 2=
0.30102. Density readout = 0.30
regards,
Ruud de Korte