Re: Illustrator conversion
Re: Illustrator conversion
- Subject: Re: Illustrator conversion
- From: Henrik Holmegaard <email@hidden>
- Date: Tue, 29 Apr 2003 10:39:04 +0200
Graeme Gill <email@hidden> wrote:
>Nope, no such thing as a CSA.
Back to basics:
1. One should not go for EPS as color managed transport format in
general, and specifically not in Illustrator which has always adopted
the position that EPS is device color only, see many past threads. One
should go for PDF as color managed transport format.
2. The acronyms CSA and CRD are used in Adobe documentation as well as
in the industry generally. The List has used the terms for years. Does
this make the term correct? No, it doesn't. Does it make the term
incorrect? No, it is a convention. For toCIE we use CSA and for fromCIE
we use CRD. Do we need to know how expressions are constructed and the
processing stack built in PostScript 3, for instance, where exactly
arrays and dictionaries come into the picture? To be honest, I don't
think so (and to be honest, I'm surprised at finding myself saying
this, but there is a balance to be struck between technology level and
interface level language(*)).
3. An object that references a CSA introduces a choice, either to
ignore the CIE reference or to apply the CIE reference. There are
implementations which ignore the CSA and apply the user's choice of
assumed source ICC profile and there are implementations which apply
the CSA. Nobody designates the object as non-rendering (or to be on the
safe side, nobody I have knowledge of). Similarly, there are
implementations which allow a device color object to be assigned a
default CSA. Which is right and which is wrong? The only thing that
matters is documenting the implementation so the user knows how the
switches in fact work.
IMO in implementation one should follow one's best convictions,
provided one state's what those convictions in fact are.
((*) Standards should have been written for users to read, but
traditionally they are not. Partly because standards refer to technical
constructs which age much slower than software functions and
interfaces, partly because software functions and interfaces differ in
how they dub the technical constructs they are in fact based upon. But
that is a broader discussion which I am certain we will return to
frequently in coming years.)
Thanks,
Henrik
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