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Adobe Creative Suite 5 Printing Guide 36
There are some font issues that Preflight does not catch: Fonts required
by any PSD files with text layers are not indicated in the list. These fonts
will not be checked for by preflight, nor will they be included when the
file is packaged, so the customer will have to manually collect them for
job submission. Suggest that Photoshop files containing text be saved
as Photoshop PDF, which embeds fonts and makes packaging fonts
unnecessary. In addition, text in a Photoshop PDF will print as sharp,
vector edges, whereas text in a Photoshop PSD will be rasterized during
print.
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Whether you use InDesign’s Live Preflight function or dedicated
preflight software, or rely on experienced prepress operators to
carefully examine incoming files, it’s important to recognize problem
files early in the production process, in the interest of saving time,
money, and sanity. For a thorough analysis, use all the forensic tools
available to youSeparations Preview, Overprint Preview, Flattener
Preview, and the Info panelin addition to the Preflight function.
Separations Preview
Use the Separations Preview panel (Window > Output > Separations
Preview) to evaluate on screen how a document will color-separate on
printed output. You can view individual spot and process color plates or
any combination of plates. Choose an option from the Separations
panel menu to view plates in their actual ink color, or as black. You can
also highlight overprinting objects and areas that exceed a specified
total ink limit, by choosing Ink Limit from the Separations Preview
panel’s View pop-up menu. If you need to make adjustments, for
immediate feedback you can edit while Separations Preview is in effect.
Adobe InDesign can preview separations by displaying any combination
of the inks defined in the document, such as the cyan plate and the
magenta plate. The results display using high-resolution screen display
engine in InDesign to more realistically represent conditions such as
overprinting, RGB-to-CMYK conversion, and spot color interactions
with transparency. Trapping, however, is not simulated. The ability to
display overprints and ink limits for any combination of plates can make
the Separations Preview capability more useful for evaluation than a
laser-printed separations proof. Separations Preview is calculated using
the ink characteristics for process and spot inks.
On an offset press, black ink is not 100% opaque. For a more accurate
simulation of black opacity, enable and properly configure color
management and choose to display blacks accurately (choose
Preferences > Appearance of Black, and choose Display All Blacks
Accurately for on screen display), or, if you have disabled color
management (not recommended), you can choose the Desaturate
Black command from the Separations Preview panel menu. Desaturate
Black reduces the visual opacity of the black plate only (this does not
affect output). Desaturate Black is redundant (and will provide an
anemic display of black objects) when color management is on and
accurate blacks are displayed.
Keep the following tips in mind as you use the Separations Preview
panel:
•CMYK plates are always listed, even if, for example, the job uses only
two spot colors. However, CMYK plates are not output if no colors
need to be printed on them.
•e Separations Preview panel lists all inks dened in a document,
whether or not they are actually used in the document. Consequently,
it is recommended that you delete unused spot-color swatches before
viewing separations.
•You can view the eect of converting spot colors to process and the
eect of aliasing a spot ink (see the previous “Using the Ink Manager”
in this section). Both of these options are available in the Ink Manager
on the Separations Preview panel menu.
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