Graphics Programs Reference
In-Depth Information
those working with untagged files or files that are in an print/
output space such as CMYK, it is useful to see how the document would
appear if the current set of numbers were simply sent to the printer as
is. For example, I'm provided a document in U.S. Web Uncoated (SWOP)
v2 but the document has to be output on a Eurocoated v2 device. With
the Preserve check box on, a soft proof is produced showing the output
of SWOP to Eurocoated v2. I can then decide if sending the SWOP file
to a Eurocoated device will produce acceptable color appearance or if I
need to edit the file or even conduct a color space conversion (CMYK to
CMYK).
The Preserve option will be grayed out unless the current color space
and the output space are the same. In other words, if the document is in
Adobe RGB (1998), and I pick U.S. Web Coated (SWOP) v2 , the Preserve
option is grayed out and unavailable. However, if I pick an RGB output
profile (Epson 2200 Luster), then the check box will be available for use.
I can see what the document would look like going to the Epson since
both document and output profiles are the same colorspace (RGB).
Use Black Point Compensation
There is a check box that allows you to soft-proof the effects of Black
Point Compensation. Although it is recommended that conversions using
ICC profiles be conducted in Photoshop with the default set to utilize
Black Point Compensation , this check box still has value. Turning it on and
off shows a soft proof when Black Point Compensation is not used. If
images that are to be converted outside of an Adobe product does not
support Black Point Compensation (like using a RIP), we can see how
the image will convert without this option. For more specifics on Black
Point Compensation, see above.
Simulate Paper White/Ink Black (Renamed Simulate Paper
Color/Simulate Black Ink in Photoshop CS2)
This is a useful option for soft-proofing documents that can produce more
accurate screen-to-print matching. With these options unchecked,
Photoshop is conducting a relative colorimetric rendering with Black
Point Compensation to the display. If a document contains a value such
as R0/G0/B0, Photoshop is attempting to preview the image to produce
as dark a value as possible on the display. The opposite is true for white
values like R255/G255/B255. The display is producing the highest lumi-
nance possible to simulate white. The problem is, this soft proof is overly
optimistic! The white of the paper and the black of the ink are far from
this intensity. There is a severe mismatch in the dynamic range of these
two extremes and in order to accurately produce a soft proof Photoshop
provides the Simulate check box for Paper White and Ink Black . In Photo-
shop CS2, these check boxes have been renamed Simulate Paper Color and
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