PS6 / Distiller 4.0.5 bug?
PS6 / Distiller 4.0.5 bug?
- Subject: PS6 / Distiller 4.0.5 bug?
- From: Henrik Holmegaard <email@hidden>
- Date: Sat, 10 Mar 2001 06:42:58 +0100
In Distiller 4.0.5 'Leave Color Unchanged' works with both 'Acrobat 4
Compatibility' and 'Acrobat 3 Compatibility'.
Using the following test matrix for CMYK page objects, CMYK will be
converted to CIELab using the bundled / built-in US Web Coated v2
profile (PSCM = PostScript Color Management) from PS6 - QXP4.11/Dist
PPD 4.0.5 / Distiller 4.0.5:
UntagICC_UntagPSCM.EPS
UntagICC_TagPSCM.EPS (CMYK is converted into Lab*)
TagICC_TagPSCM.EPS (CMYK is converted into Lab**)
TagICC_UntagPSCM.EPS
TagICC.TIF
UntagICC.TIF
* Simple to verify in InProduction
** Verified as non-CMYK in InProduction (this v1.0 IP UI is tough to
negotiate).
PDF 1.2 / Acrobat 3 supports the device color specification and the
CIEBased color space specification. Therefore, there is a choice.
If told to leave the color unchanged, then Distiller can just take
the CMYK values and encode them as deviceCMYK. That's what the
majority of prepress and printing people want.
This would jive with the 'Print 4 color ICC profiles as deviceCMYK'
button in Acrobat 4 which basically untags the CMYK data and dumps it
into the RIP. That's also what the majority of prepress and printing
people want.
As far as I recall, the PDF 1.2 spec says to convert CMYK to Lab only
when device inpedence is chosen. If the user deselects device
independence, the I don't see why this behaviour occurs when
Distiller is tickled with a CMYK CSA.
Also the behaviour is not really consistent in different parts of the
Acrobat 4 UI. Or maybe it's just because it's late that I get
confused here -:).
--
Henrik Holmegaard
TechWrite, Denmark