Impressions - April 2018 - 39
think.
SCREEN PRINTING GRAPHICS & DESIGN
make.
Like this article? Read more screen-printing
articles at impressionsmag.com/screenprinting.
do.
Your Underbase
is Showing
Follow these tips for fast
trapping during art separations.
BY ThomaS Trimingham, ConTriBUTing WriTer
It can be scary to realize a print's underbase is showing when it shouldn't be.
Many times, a design's top colors should
completely cover the underbase, but a
variety of things can happen to cause the
white print on a dark garment to spread
slightly and peek out from beneath the
edges of the top colors.
If clients see this, they may complain and
even reject the job, so don't take chances
with separations and create an allowance
for the underbase to adjust, depending on
Figure 1
your registration tightness and stability.
If you are new to screen printing, the
top colors that are brighter - such as red,
blue and green - will look faded and
could even change without an underbase
on a shirt that isn't white.The underbase
typically is designed to be printed under
all of a design's colors except black.
Creating separations for screen printing
isn't just a simple process of duplicating
all of a design's top colors and mashing
them together to create an underbase.
You must consider how the final print
will look.
Designing an Underbase
It should be easy to create an underbase
for a simple spot-color design (see Figure
1). In Adobe Photoshop, you can see how
an underbase will work for a design by
creating a simulated digital mockup using
alpha channels below the image channels.
Input each color separation into a channel
and create a shirt channel, then turn on each
channel in descending print order to show
how the print will build out on the press.
The advantage of doing this is that you
can see where the underbase is visible
underneath other colors. All it takes is a
push in the middle of the Curves menu
to determine whether the underbase will
gain enough to show past the design's
edges (see Figure 2).
It makes sense to compensate for the
spreading of the white ink in different
ways to avoid combatting it on press. Perform test prints with high-contrast and
kiss registration (where the print barely
touches the neighboring color and doesn't
overlap). Using a detailed test print will
reveal whether the press and some production areas need adjustment prior to
creating compensation at the artwork's
edges. (see Figure 3)
Once you have adjusted equipment
to achieve the least amount of gain at
the underbase's edges, you can create a
method to compensate for this in artwork.
APRIL 2018
P.39
http://www.impressionsmag.com/screenprinting
Impressions - April 2018
Table of Contents for the Digital Edition of Impressions - April 2018
Impressions - April 2018
Contents
First Impressions
From the Show Director
Overheard
First Look
Scene at ISS
On Design
Changing Tides
Breakdown: Heat Transfers on a Hoodie
The Brand Boost
Pushing the Pedal in Purchasing
Shop Talk
Embroidery Production
Screen Printing Graphics & Design
Sublimation
Direct-To-Garment
Classifieds
Ad Index/Online Directory
Impressions - April 2018 - Intro
Impressions - April 2018 - CT1
Impressions - April 2018 - CT2
Impressions - April 2018 - Impressions - April 2018
Impressions - April 2018 - Cover2
Impressions - April 2018 - 1
Impressions - April 2018 - Contents
Impressions - April 2018 - 3
Impressions - April 2018 - 4
Impressions - April 2018 - 5
Impressions - April 2018 - First Impressions
Impressions - April 2018 - 7
Impressions - April 2018 - From the Show Director
Impressions - April 2018 - 9
Impressions - April 2018 - Overheard
Impressions - April 2018 - 11
Impressions - April 2018 - 12
Impressions - April 2018 - 13
Impressions - April 2018 - 13A
Impressions - April 2018 - 13B
Impressions - April 2018 - First Look
Impressions - April 2018 - 15
Impressions - April 2018 - Scene at ISS
Impressions - April 2018 - 17
Impressions - April 2018 - 18
Impressions - April 2018 - On Design
Impressions - April 2018 - Changing Tides
Impressions - April 2018 - 21
Impressions - April 2018 - 22
Impressions - April 2018 - 23
Impressions - April 2018 - Breakdown: Heat Transfers on a Hoodie
Impressions - April 2018 - 25
Impressions - April 2018 - The Brand Boost
Impressions - April 2018 - 27
Impressions - April 2018 - 28
Impressions - April 2018 - 29
Impressions - April 2018 - Pushing the Pedal in Purchasing
Impressions - April 2018 - 31
Impressions - April 2018 - 32
Impressions - April 2018 - 33
Impressions - April 2018 - Shop Talk
Impressions - April 2018 - 35
Impressions - April 2018 - Embroidery Production
Impressions - April 2018 - 37
Impressions - April 2018 - 38
Impressions - April 2018 - Screen Printing Graphics & Design
Impressions - April 2018 - 40
Impressions - April 2018 - 41
Impressions - April 2018 - Sublimation
Impressions - April 2018 - 43
Impressions - April 2018 - 44
Impressions - April 2018 - Direct-To-Garment
Impressions - April 2018 - 46
Impressions - April 2018 - 47
Impressions - April 2018 - 48
Impressions - April 2018 - Ad Index/Online Directory
Impressions - April 2018 - 50
Impressions - April 2018 - Cover3
Impressions - April 2018 - Cover4
Impressions - April 2018 - IH1
Impressions - April 2018 - IH2
Impressions - April 2018 - IH3
Impressions - April 2018 - IH4
Impressions - April 2018 - IH5
Impressions - April 2018 - IH6
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