Screen Printing - February/March 2018 - 30

figure 5

figure 6

figure 7

Once you have created each of the colors in separate Alpha Channels and edited them,
you can generate an approximation of what the design will look like by converting the
Alpha Channels to the ink color you'll be printing. this will help you judge whether the
alternative underbase color is working.

30

screenprinting

1. Create an Image Channel just below
the RGB channels. Make it the same
color as the shirt, name it "blue
shirt," and then make five Alpha
Channels underneath it. These
channels will be underbase bluegray, blue, black, highlight white,
and yellow gold. (See Figure 2.)
2. Next, duplicate the file, change the
background to black, and convert it
to L*a*b* color. Copy the Lightness
Channel from the duplicate and then
paste it into your original file as the
"underbase channel." (See Figure 3.)
3. Next, create the information for
the other channels. You do this by
duplicating the original file again,
converting the background to white,
and then changing your image to
CMYK mode with the Maximum
Black setting turned on. I find that
doing these types of underbases
in CMYK rather than using Color
Range gives the overprint colors
a desirable gloss, more like an oil
painting than a solid spot color.
Edit your CMYK properties first:
Edit/Color Settings/CMYK; select
Custom CMYK, and change black
to maximum, as shown in Figure 4.
4. Once your duplicate file is converted
to maximum black CMYK, copy and
paste just the cyan, yellow, and black
channels into the "blue," "yellow," and
"black" separation channels in your
original design. (See Figure 5.)
5. Delete the copy of your original file
to avoid confusion and then edit the
copied channels to boost color and
remove any ghosted areas using the
Curves menu on each separation
channel (Control/Command-M).
Finalize the design using the Color
Range tool with the background
temporarily converted to black to
select your highlight white
channel. (See Figure 6.)
6. The final step is to convert all your
Alpha Channels in Channel Options
to match the ink color you will print.
(You can use Color Picker for this or
a PMS color match from the library.)
Change the Alpha Channel to Spot
Color and the opacity to



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Screen Printing - February/March 2018 - Cover1
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Screen Printing - February/March 2018 - 1
Screen Printing - February/March 2018 - Contents
Screen Printing - February/March 2018 - 3
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