Adobe PHOTOSHOP 5.0 User Manual page 350

342 CHAPTER 15
Printing
To adjust the display of overprint colors:
Choose Image > Mode > Duotone.
1
Click Overprint Colors. The Overprint Colors
2
dialog box displays the combinations that will
result when the inks are printed.
Click the color swatch of the ink combination
3
you want to adjust.
Select the color you want in the color picker, and
4
click OK.
Repeat steps 3 and 4 until the overprint inks
5
appear as you want them. Then click OK.
Saving and loading duotone settings
Use the Save and Load buttons in the Duotone
Options dialog box to save a set of duotone curves,
ink settings, and overprint colors. You can then
apply these settings to other grayscale images.
In addition, the Adobe Photoshop program
includes several sample sets of duotone, tritone,
and quadtone curves. These sets include some of
the more commonly used curves and colors and
are useful as starting points for creating your own
combinations.
Viewing the individual printing plates
Because duotones are single-channel images, your
adjustments to individual printing inks are
displayed as part of the final composite image. In
some cases, you may want to view the individual
"printing plates" to see how the individual colors
will separate when printed (as you can with CMYK
images).
To view the individual colors of a duotone image:
After specifying your ink colors, choose Image >
1
Mode > Multichannel.
The image is converted to a multichannel image,
with each channel represented as a spot-color
channel that can be edited independently. The
contents of each spot channel accurately reflect the
duotone settings, but the on-screen composite
preview may not be as accurate as the preview in
Duotone mode.
Important: If you make any changes to the image in
Multichannel mode, you will be unable to revert to
the original duotone state. To adjust the distribution
of ink and view its effect on the individual printing
plates, make the adjustments in the Duotone Curves
dialog box before converting to Multichannel mode.
Select the channel you want to examine in the
2
Channels palette.
Choose Edit > Undo Multichannel to revert to
3
Duotone mode.
Printing duotones
When creating duotones, keep in mind that both
the order in which the inks are printed and the
screen angles you use dramatically affect the final
output. (See "Specifying the duotone type and ink
colors" on page 340.)