Desktop Publishing Carnegie-Mellon University Spring 2001

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Desktop PublishingCarnegie-Mellon
UniversitySpring 2001

• Dave WattersonArt Director, GATF
• wttrsn_at_aol.com
• dwatterson_at_gatf.org

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Spot Colors

• Requires blending different inks into one ink to
  obtain the desired hue
• Similar to mixing paints on a palette or for a
  house

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Four color Process

• Dots, Dots, Dots
• Patterns of dots (rosette pattern) simulate the
  desired hue

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Spot Colors

• Require one press unit to apply desired color
• Spot Color inks are more expensive than Process
  Inks
• With process printing spot colors require a 5th
  unit or second pass through the press

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Process Colors

• 4 units, Cyan, Magenta, Yellow Black
• Can simulate Pantone colors
• Process colors are cheaper than spot colors (you
  get what you pay for!)

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Out of Gamut

• Some Spot colors CAN NOT be approximated by the
  process color system
• Metallic inks
• Neon Inks

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Color Reference Systems

• Pantone
• Trumatch
• Focoltone
• Toyo

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Pantone

• Most universally recognized
• Originally strictly a spot color system13
  original colors
• Process approximations

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Trumatch

• 4-color process system
• Arranged by Hue, Saturation, Value
• Very reliableseldom used

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Focoltone

• Stands for Four-Colour-Tone
• More widely used in Europe and Asia
• Different Inkset
• Can check colors progressively

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Toyo

• Great when using Toyo inks
• Used most widely in Pacific rim countries

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Color Critical Issues

• Surround
• Paper
• Densitometric verification

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Drawdown

• On YOUR paper
• With YOUR ink
• By YOUR printer

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Color Control Bar

• Measure/Calibrate/Evaluate
• Star Targets
• Dot Gain Scales
• Solid Ink Density
• Quarter- Mid- Three-quarter tone patches

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Controlling Color Quality

• Quality of originals and separations
• Paper Surface coatings and color
• In color and density
• Varnish or Coating

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Printer Controlled Factors

• Ink Tack
• Pressroom humidity
• Paper conditioning

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Uncontrollable Factors

• Color deficiencies
• Viewing light
• Age of pieceEnvironmental effects
• Effect of sunlight

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Color Quality

• Pleasing colorBasic printing
• Match colorGood/Premium printing
• Match originalPremium/ Showcase printing

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Contacting me

• I dont have an office on campus and really work
  all day
• Please e-mail me and I will set up a meeting time
  as quickly as possible

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Thanks for your attention! Now lets head over
to the lab(CFA Room 318)