JRN 302: Introduction to Graphics and Visual Communication - Commercial Printing Wednesday, 7/22/15.
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Transcript of JRN 302: Introduction to Graphics and Visual Communication - Commercial Printing Wednesday, 7/22/15.
JRN 302: Introduction to Graphics and Visual Communication- Commercial Printing
Wednesday, 7/22/15
Class Objectives
Lecture Commercial Printing Designing for Print
Homework assignments ID Tutorial due by the end of class Thursday
Cyan, magenta, yellow, and black(k) Color mixture in print Subtractive: all added together make black
Due to impurities of ink, all added together really makes it muddy brown, so we add black ink
CMYK (review)
Best practices when workingin Photoshop (review) CMYK has a smaller number range of color
than RGB, therefore you will be unable to do everything in Photoshop when in this mode
Best advice, always start in RGB and make your all of your changes, then, as a last step, convert to CMYK image mode.
Limitations of RGB and CMYK modes and Photoshop
CMYK is limited in color representation. Most filters only work in RGB
CMYK doesn’t have nice pinks or bright greens
RGB’s yellows and oranges are lesser
Even though you're working in CMYK mode, your monitor is RGB so Photoshop is converting these values continuously (used to slow computer down)
When will you see a change?
If you use somewhat “neon-looking” colors
Photoshop Color Warnings
Pay attention to out-of-gamut for printing
Ignore warning about ‘not web safe’
When to use CMYK (review)
If you are working as a graphic designer and will be sending your image to a commercial printer, you will need to convert to CMYK
If not, they will
charge you an
extra fee to do this
Types of commercial printing presses Sheet-Fed Offset Printer
Mainly used to print brochures, magazine advertisements, cards, etc.
Uses sheets of paper Web-Fed Offset Printer
Mainly used with newspaper printing Uses a continuous roll of paper
http://www.youtube.com/watch?v=AyxSLOZaj-M (5 minutes)
Printing Presses
Determine # of colors by “humps” Presses can only print 1 ink at a time
6 color press prints 6 inks at one pass
C
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4 color press prints 4 inks
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Where do you add the ink?
At the top of each press hump
2 methods for printing color on a press
Process Overlapping of cyan,
magenta, yellow and black
Colors do not mix on paper; your eye mixes color
Spot The printing ink is just
the right color you want
Process colors
Cyan, magenta, yellow, and black These are printer's primaries and can be
combined to create the majority of visible ink colors. Again, they do not blend together… your eye
blends the dots on the page Do not confuse 4 inks colors to mean you can
only print 4 colors
When to use Process Inks
Most of your print jobs will be done in process (cymk) inks Positive: good for complex imagery
(photographs) Process is “generic” ink
Compare to generic soda pop Positive: cheap (esp. if your print job is not color
sensitive) Negative: color may not be the same
Different ink manufacturers Different presses (some run “hot”, others run “cold”)
What is Spot Color
Instead of using a “generic” ink, you select the exact ink/color you want to use
The most common spot color system is Pantone Is the main international
reference for selecting, specifying, matching and controlling ink colors.
In Photoshop, to see Pantone colors, click on your Foreground Color, and select Color Libraries.
Pantone Matching System (PMS)
An international color language that helps the designer to communicate colors for reproduction
Each ink color is assigned a PMS number and is created using a specific formula.
When a commercial printer uses Pantone colors, they buy that specific ink and load it into their printing press. Do not need to mix inks to get
Pantone color
When to use spot color
To maintain consistent color In a logo, you want to make sure your red
is the same red, not matter what ink brand or press it runs on
With a spot ink/color, the color reproduction will be identical every time you print
No matter where you print your job Different printers Different materials (labels, t-shirts,
brochures on plastics, paper, fabric, etc.)
When to use spot color
To reduce costs In a 2 color job, use black and
Pantone Red #whatever and Pantone Blue #whatever… job can be run on 2 “hump” (ink) press
If you don’t specify a Pantone color, the red will be made up of cmyk… and job is now a 4 ink job
When to use spot color
Certain colors can’t be mixed Metallics can’t be mixed by using cmyk Example, Purdue logo is officially old gold
Pantone1245 (uncoated) and black Cheap work around is they use yellow or brown
instead of gold so you don’t have to pay for spot inks in a printed piece
Remember, colors on your monitor may not look the same as those printed