Re: Re: HP 10ps buying info
Re: Re: HP 10ps buying info
- Subject: Re: Re: HP 10ps buying info
- From: email@hidden
- Date: Mon, 26 May 2003 09:21:09 EDT
In a message dated 5/25/2003 10:19:09 PM Pacific Daylight Time,
email@hidden writes:
>
>Sure, but the goal for the DesignJet printing pipeline cannot
>
>reasonably be to offer a system which supports whatever inks and
>
>whatever papers.
>
>
Of course it can. The limitations it has are unnecessary. Provide
>
the sensor readings as absolute, and it's dead easy to subtract
>
out the paper value.
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...
Eric Walowit
Tahoe
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