Re: Spectro question
Re: Spectro question
- Subject: Re: Spectro question
- From: Graeme Gill <email@hidden>
- Date: Tue, 03 Sep 2002 13:16:43 +1000
"James B. Reswick, Jr." wrote:
>
My question is (finally): How can the profiling software know what
>
corrections to make when comparing only the CMYK text values associated with
>
the target's patch and the measured Lab values for that patch, when the
>
information contained in the target's CMYK text values are relative
>
percentages? Wouldn't two device-independent coordinate descriptions for that
>
patch (one provided and one measured) have to be available for there to be a
>
comparison? Wouldn't an additional text file with Lab coordinates have to be
>
provided with the target?
You are missing a major step. You can't make a CMYK1->CMYK2 device link
without _two_ device profiles. The steps you outline are the steps
to create a mapping between device independent colorspace and
a single device (PCS<->CMYK2). To create a CMYK1->CMYK2 mapping
you need to link two device profiles (CMYK1->PCS->CMYK2). The
choice of input profile (CMYK1->PCS) determines which color
space will be emulated by your actual output device (PCS->CYMK2).
Graeme Gill.
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