InDesign proofing ABC
InDesign proofing ABC
- Subject: InDesign proofing ABC
- From: Henrik Holmegaard <email@hidden>
- Date: Wed, 15 Aug 2001 21:25:09 +0200
This is the short version -:)
InDesign classifies placed objects and objects you draw in InDesign
by their data type (like PostScript). 'Solid Colors' means vector
*and* raster objects in PDF and EPS. 'Images' means raster objects
including TIF (Scitex CT is uninteresting as it neither supports Lab
nor embedded ICC profiles ... except with the Helios workaround).
In InDesign rendering intents apply to 'Images', and to 'Solid
Colors' you draw using InDesign itself. They do not apply to 'Solid
Colors' you place (i.e. EPS and PDF).
If EPS contains Lab, no host-based conversion is applied, even if
'Simulate Separation Printer on Composite Printer' is checked.
If EPS contains RGB with an ICC profile (e.g. Adobe RGB) but no CSA,
deviceRGB is printed even if 'Simulate Separation Printer on
Composite Printer' is checked.
If EPS contains CMYK with an ICC profile (e.g. EuroScale Uncoated /
COMMSP4 with a black point of L 31), deviceCMYK is sent to the RIP
which prints the offset numbers as is even if 'Simulate Separation
Printer on Composite Printer' is checked.
If PDF contains Lab, no host-based conversion is applied, even if
'Simulate Separation Printer on Composite Printer' is checked.
If PDF contains RGB, no host-based conversion is applied, even if
'Simulate Separation Printer on Composite Printer' is checked.
If PDF contains CMYK then offset deviceCMYK is not sent but also the
proof conversion is not applied, because the black point comes out at
L 8. It so happens that L 7 is the black point of the proofing paper
currently in the printer, which again means that InDesign is not
sending values to the RIP that represent proofed CMYK values, but
sending an Lab simulation which the RIP must print using a built-in
CRD ... quite nice graybalanced CRD btw -:).
Only TIFF converts correctly, but with a caveat worth keeping in
mind. If you choose Relative Colorimetric for Lab or RGB, InDesign
does not clip colors in your from L 0 to L 31 to L 31 like Photoshop
6 does, but to L 40 for some reason. And there's no Black Point
Compensation for RelCol yet.
Also intents are applied symmetrically from RGB / Lab working space
to CMYK simulation to RGB monitor soft proof space. I was confused by
the complexity introduced by the formats. The way to test InDesign
softproofing is to create nine wedges with 21 steps, print to disk
for Distiller, check with InProduction, and check on the printer:
a. Lab TIF, Lab EPS, Lab PDF
b. RGB TIF, RGB EPS, RGB PDF
c. CMYK TIF, CMYK EPS, CMYK PDF
Interestingly, the InDesign monitor preview warns you as it should.
The clipping is shown for TIF, along with the light blacks. The lack
of clipping is shown for EPS and Lab. The only difference is CMYK EPS
which is soft-proofed right on the monitor but not proof-printed
right on the printer, so the soft proof and proof print don't match.
Again : As long as TIF is used then InDesign works. The complexity
comes when you add encapsulated formats.