Re: Color space specification ABC
Re: Color space specification ABC
- Subject: Re: Color space specification ABC
- From: Henrik Holmegaard <email@hidden>
- Date: Wed, 31 Oct 2001 08:27:39 +0100
Martin Bailey wrote:
Some RIPs (not sure enough to give a public listing, but definitely
including Harlequin with the color management options) can also load ICC
profiles which are used on the output side as well as the input side of the
CMS.
I wrote:
What you can do as a RIP manufacturer is provide a UI that allows
users to load ICC profiles which behind the scenes are then converted
into PostScript color tables.
We are saying the same thing.
I should possibly remind you that Harlequin also reads incoming CSAs,
though in the original offline reply from '97 it was not specified
whether the functionality covered three channel or additionally four
channel CSAs.
The point again is to make users aware that sending a Level 1, Level
2 or Level 3 RIP deviceRGB will result in the standard conversion
described in the iQueue manual. Sending a Level 2 or Level 3 RIP Lab
or calibratedRGB (an RGB object with a CSA ... regardless of whether
that CSA hails from an ICC format color space specification or a
proprietary Photoshop ditto) likewise results in an in-RIP
transformation.
The important point for users to understand is that the PostScript
CMS antecedes and is in principle independent of the ICC framework.
If users don't realize that the archaelogical strata here represent
two successive and only partly overlapping cultures of reproduction,
they will not realize that rather different strategies and tactics
are envisaged by these frameworks.
A difference is not a deficiency. I am not saying that the PostScript
CMS is deficient because it is different. But I am saying that if as
a user you do not know how it is different, then you have lost up
front.
Excellent post, and very good advice
Thank you.
I would prefer to continue this discussion on the ColorSync Users
List which is much more effectively written by the list members, and
as it is older consequently also offers a higher level of technical
expertise for all-round clarification.