Re: CMYK to Lab bug (part 1)
Re: CMYK to Lab bug (part 1)
- Subject: Re: CMYK to Lab bug (part 1)
- From: Henrik Holmegaard <email@hidden>
- Date: Wed, 14 Mar 2001 08:45:23 +0100
Roberto wrote:
I wouldn't say so; Distiller is a Postscript rip, and supposedly it
understand the ICC profiles embedded into it, and embeds them in the PDF
(since 1.3) tagging the images or elements that had the profiles as tags
in postscript.
Nope, PostScript does not support the ICC color space specification
format. It only supports in-RIP CSAs and CRDs. Adobe is playing with
terminology by renaming CSAs and CRDs 'profiles'.
EPS is kind of funny because it both supports embedded ICC profiles
on a per object basis and the CSA for the chosen rendering intent on
a per object basis.
PDF is a attempt to create a Super EPS which is directly viewable and
compressable and self-contained with no external resources. Hence it
should work better for blind exchange. Which takes us to the
subsetted PDF/X concept which tries to reduce the number of
parameters left open in 'raw' PDF. So the idea here is to go to
tagged CMYK - not to untagged Lab -:).
Apple originally had a competing technology in QuickDraw GX which I
always liked - ah for the GX fonts, the transparency, all the
goodies. But it wasn't PostScript and hence not politically correct.
Apple's Super EPS was called Portable Digital Document format. It was
a spool file and you could subset fonts and all. People didn't want
it also because it didn't have compression. It was high resolution.
--
Henrik Holmegaard
TechWrite, Denmark