Re: What goes inside %¾ginSetColorSpace and %EndSetColorSpace comments?
Re: What goes inside %¾ginSetColorSpace and %EndSetColorSpace comments?
- Subject: Re: What goes inside %¾ginSetColorSpace and %EndSetColorSpace comments?
- From: Graeme Gill <email@hidden>
- Date: Sun, 07 May 2006 12:52:19 +1000
Giordano Galli wrote:
I would like to know whether the examples given on pages 67 and 68 of
the ICC.1:2004-04 specification have to be taken as the only way to
attribute embedded ICC profiles to PostScript colours.
What do you mean by "attribute" ?
I'm asking because, under certain circumstances, Photoshop's behaviour
seems to me to be at variance with this limitation.
The the ICC spec indicates that there is only one circumstances where
ICC profiles might usefully be embedded in EPS files, and that is where
services such as OPI need to do color conversions along with image
replacement.
Is the suggestion then, that Photoshop EPS files with embedded ICC
profiles are a source of images for an OPI server ?
More precisely I would like to be confirmed that the following is true:
- an ICC profile only refers to colours specified in the colour space
instantiated in the %¾ginSetColorSpace and %%EndSetColorSpace
section labeled by the same <profileid>
The ICC note implies that.
- inside %¾ginSetColorSpace/%%EndSetColorSpace sections, only
CIE-Based colour spaces are allowed as operands of setcolorspace
PostScripts only mechanisms for defining custom input colorspaces (the
PostScript equivalent to an ICC device input profile) are the CIEBased*
spaces. So the implications is that yes, these are the only operands that
will be found between %¾ginSetColorSpace/%%EndSetColorSpace.
- device colour spaces have nothing to do with embedded ICC profiles;
in particular, it is illegal to implicitly refer to, for example,
DeviceCMYK from an unmatched %¾ginICCProfile %%EndICCProfile
section bracketing a cmyk profile.
Probably. Technically a PostScript file could indirectly refer to
a CIEBased colorspace if the "UseCIEColor" switch is flipped,
so that the device colorspaces are passed through the CIEBased
colorspace machinery.
How this interacts with %¾ginSetColorSpace/%%EndSetColorSpace
I haven't thought about.
If you are after definitive answers, you need to talk to someone
at Adobe. Perhaps Chris Cox may choose to answer your questions ?
Graeme Gill.
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