Re: Spectro question - try again
Re: Spectro question - try again
- Subject: Re: Spectro question - try again
- From: Andrew Rodney <email@hidden>
- Date: Tue, 03 Sep 2002 14:13:01 -0600
on 9/3/02 1:45 PM, email@hidden at email@hidden
wrote:
>
If the data (in the target) being sent to the output device for profiling
>
is CMYK numbers, and the data being captured by the measuring device is LAB
>
space numbers, how can the profile building software compare these two
>
different types of numbers in a meaningful way?
In an ICC workflow, there always has to be a source and destination. This
CMYK profile is only one part of the equation. It's like asking for
directions and only getting the destination, not the location you are
starting from. You'd never find your way...
CMYK is an output space. There are no devices that capture CMYK but we need
to end up there so we can take our files and print them to the device we
have this CMYK profile for. We do have a source (it's RGB data from a
digital camera or scanner) or it's a file we've edited that is in an RGB
Working Space. We can't send RGB to the printer, we need CMYK numbers. So we
take TWO profiles that describe the source (let's say Adobe RGB 1998) and
the destination (Greg's CMYK), and we can get from point A to point B. That
LAB is used in between isn't really all that reverent for this discussion.
What we want is to get from some flavor of RGB to some flavor of CMYK.
A single profile by itself is much like one hand clapping!
Profiles don't correct, they describe.
Andrew Rodney
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