Photoshop and Color Management - Color Management for Photographers - page 75

Fig. 2-12 The custom Dot
Gain dialog allows specific
measured dot gain values
to be entered here. This
would allow a user to
optimized a Grayscale file
for viewing on-screen or
output to a specific device
based on these
measurements.
is a way to produce a customized dot gain setting for a specific printing
condition. A Custom Gamma menu is also available, where other gamma
settings can be specified. If for some reason you might be working with
a gamma setting other than 1.8 or 2.2, feel free to enter a value. I can't
imagine why you would do this but the capability exists. The Spot pop-
up menu works like the Grayscale options discussed. This setting is used
for setting a dot gain when simulating Spot Colors. If you know the dot
gain for a spot color then those values should be inserted in this area.
Preset values are available or a curves dialog can be called up, and like
the Grayscale settings, you can enter specific known values.
Section 3: Color Management Policies
The Color Management Policies can take time to explain. Fortunately, a
tutorial will aid in understanding their various roles and behavior. Before
I describe the three policies and the options they provide, it is first nec-
essary to understand when these polices will be called upon. The color
policies affect document handling that can optionally warn the user based
upon the settings of three warning check boxes. The policies are based
upon three differing conditions of a document you are handling within
Photoshop, and are defined here. The three possible warnings are also
described.
1. The color space of a document and the color space selected in
the color settings do not match; for example, opening a
document in Adobe RGB (1998) when the RGB working space is
set to ColorMatch RGB. When the color space of a document
being opened matches the preferred working color spaces in
your color settings, the document opens, and the polices play