Re: HP 10PS printer
Re: HP 10PS printer
- Subject: Re: HP 10PS printer
- From: Dan Reid <email@hidden>
- Date: Thu, 08 Nov 2001 11:27:04 -0700
on 11/8/01 8:14 AM, Steve Lawrence at email@hidden wrote:
>
> The calibration process prints a target of series of percentages of each
>
> primary and LT primaries. Instead of 4/C printout the calibration chart
>
> had separate ink percentage calibration for the LT cyan and magenta.
>
> Weird.
>
>
Hi Dan, Thanks for the informative feedback.
>
>
Obviously the RIP has to separate the CMYK data into CMYKcm. For that
>
separation
>
to operate predictably it makes sense to build the separation table based off
>
a
>
known state. Just as you do when creating CMYK separations. You can ensure
>
that
>
happens by including light ink swatches on the calibration chart. That makes
>
sense to me as a printer driver developer and is why I believe they appear
>
separately on the chart rather than interspersed with the heavy ink swatches.
>
>
Steve Lawrence
Interesting. I have never encountered this approach before. Normally we
linearize with the LT cyan and Magenta engaged to ensure a linear response
on the those primaries. Reading them separately could, in theory, produce
non-linear response since the relationship of LT and pure primary are not
measured together. Thanks for your response.
--
Dan B. Reid
RENAISSANCE PHOTOGRAPHIC IMAGING
Color Imaging Solutions Provider
http://www.rpimaging.com | email@hidden
Toll Free: (866) RGB-CMYK [ 866-742-2695 ]
Local: (505) 471-4126