Re: Measurement Geometry
Re: Measurement Geometry
- Subject: Re: Measurement Geometry
- From: Stephen Lawrence <email@hidden>
- Date: Fri, 17 Feb 2006 22:14:40 +0000
Steve Upton wrote:
What you need to do is remove the scattered light from the reading.
Scattered light is, conveniently, polarized. So if we take our
readings through a polarized filter then the instrument can see
beyond the scattered light and into the paper. It does "overshoot"
a little but it makes a huge difference and improvement.
I agree that a polarising filter can help when taking certain kinds
of readings. But one word of warning for those considering doing so
from my own experience. When taking calibration density readings for
photo inkjets on certain papers you can find the reading actually
exceeds the spec for the instrument (2.5D off the top of my head for
the Spectrolino). The instrument will probably return a value so
unless you are keeping an eye on the intensity of your swatches you
might not notice this, but the value will not be "certified". Of
course this would also be true of most, if not all, of the
Spectrolino's competitors.
Long live the Spectrolino/Spectroscan. It is, by far, the most
reliable and flexible instrument for color management readings in
its class. (and it's why we have a bank of them for our ColorValet
profiling service)
Hallelujah brother! Lets hope the lurking Product Managers add a full
set of user selectable filters to their next set of speed machines.
Best Wishes,
Steve
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