Re: Profile compression
Re: Profile compression
- Subject: Re: Profile compression
- From: Graeme Gill <email@hidden>
- Date: Sun, 05 Mar 2006 00:22:43 +1100
Tom Beckenham wrote:
Firstly, I can't believe I missed the URL Profile Specification in the
PDF/X-5 spec! I'd actually read through the two specs but somehow missed
it. I have actually been working on getting an Australian PDF/X
technical committee together, so we can give input into future specs.
Big oops on missing that one!
I can't say I'm a big fan of the idea of URLs substituting for profiles
in document files. To me this looks like a way of making files more fragile,
for not a lot of benefit. URL's seem to have a bad habit of "rotting".
Over the years, there have been no end of niggling problems
with fonts, when they are included only by reference. Fonts missing or
mis-matching seems to be one of the issues that the latest standards
have tried to address, by going the opposite direction - making sure
that files are fully self contained.
Of course, for a closed application that depends on network
access, there may well be good reason to download various resources
on demand.
I think there's still more that could be done by the ICC in defining a
profile format that can be efficiently used by remote users. There are a
couple of things I can think of that could extend this idea further.
What about being able to reference the tags/tables as separate URL
referencable files? This way a CMM could download only the pieces of a
profile it needs. Instead of the tag table including offsets, it could
include URLs. That way when doing a perceptual conversion for example,
you'd only download the perceptual table you need.
Why complicate the ICC standard with such a narrow solution ? Why not
instead, simply implement or use a remote file system, with local
caching ? The application could just read the parts of the ICC profile
it needs remotely, without needing any application code changes.
Graeme Gill.
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