Re: Spectro question - try again
Re: Spectro question - try again
- Subject: Re: Spectro question - try again
- From: email@hidden
- Date: Tue, 3 Sep 2002 14:45:52 -0500
James Reswick Jr. asks some interesting question and received several
answers - which - IMHO all missed the point he was driving at. This still
leaves a good question on the table. Let me restate his questions the way I
understand it, and see if there are any takers.
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?
He goes on to ask if the numbers used for both steps (target printing and
measurement) should be the same type of numbers (device-independent
coordinates) in order to facilitate a comparison during the building of a
profile. Or, if the two are not the same type of numbers, shouldn't there
be another file for the output that cross references the print values with
Lab values? This would then allow the Lab measurements to be easily
compared to the Lab references for output.
Any insights?
>
>
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?
>
>
The Measure Tool accepts Lab text files to reference, so that a Lab file
can
>
be printed through an output profile and then compared against its
respective
>
Lab data, but the Profile Maker will not accept Lab data as a reference.
>
>
As always, thanks again for your help...
>
>
Jim
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.