Re: HP 10ps buying info
Re: HP 10ps buying info
- Subject: Re: HP 10ps buying info
- From: Graeme Gill <email@hidden>
- Date: Tue, 27 May 2003 11:32:08 +1000
email@hidden wrote:
>
I'd bet that providing absolute values would be far more complicated and
>
expensive than what they are probably doing. They probably use light sources and
>
sensors whose peak wavelength/sensitivity combinations are well-tuned to the
>
wavelengths of peak absorption of the ink and paper combinations supported. In
>
this manner one can easily measure non-status relative densitometry and if one
>
knows the spectral properties of what one is measuring a priori, can convert
>
to colorimetry. Measuring something of arbitrary and unknown spectral
>
composition is a much different beast...
I can't imagine this is the case. It's easy to calibrate against
a reference reflector, it then takes work to measure each
of your different paper stocks, program a table into
the machine, and then subtract out the base reflectance
values. I think it's a case of the printer trying to be "too smart",
and assuming that it makes it easier for the calibration software
if it gives it "pre-cooked" reflectance values.
Graeme Gill.
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