Re: Color space specification ABC
Re: Color space specification ABC
- Subject: Re: Color space specification ABC
- From: Henrik Holmegaard <email@hidden>
- Date: Tue, 30 Oct 2001 14:17:05 +0100
You can then import these files into
Quark, save out a PostScript file, distill to PDF and each image file will
appear 'correctly' in your PDF on-screen. Also, each image will be tagged
with the correct ICC profile (or more accurately, with the correct
PostScript Color Management information).
When a user-named ICC device profile is subset into a PostScript
color space specification, the name is in some cases retained and in
others it is not.
Photoshop writes into EPS generated by the Save As workflow the name
of the color space specification file, but does not tell you the
format of the color space specification, and therefore does not warn
you what happens when the object and the color space specification
undergoes a conversion into PDF.
Distiller 4.0.5 and InDesign 1.5.2 will convert an object that
references a CIEBasedDEFG color space array to Lab, and leave objects
that reference a three channel CSA alone. There is no trace of the
source space for troubleshooting purposes.
Distiller 5.0 will convert a CIEBasedDEFG color space array to a
barely legal ICC CMYK profile, but the name of the original ICC CMYK
profile is not retained, but the name of the ICC color space
specification clearly states it derives from a PostScript Color Space
Array, which should warn you that the functionality is not identical
to that of the original. You do not know the source space, but in
most workflows this is not going to affect what you are able to do
successfully with the PDF file (: keeping in mind that the embedded
CSA -> ICC profile should not be extracted and used as output
profile, but only for simulation, and only if the output process has
a large L range or you will not be able to generate a contract proof
since the conversion as far as I recall alters the black point to L
0).
Hope this helps.