Colour Printing

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Colour Printing

• Kazushige HATORI
• IOF IT commissionWOC2005 mapper and so on..

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Summary

• Background
• Why is the colour specification needed ?
• What are the problems in colour printing ?
• How to solve them ?
• Consequences and proposal

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Background in colour printing

• - Nowadays
• 2004 latest model canon personal inkjet printer,
  best one for 300euro, 35sec/sheet (normal quality
  70 A4)
• Over half of o-maps in competition use may be
  printed with course directly from OCAD8 in 2005
  (even woc2005 public races)

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Background in colour printing 2

• - In near future
• Double the speed with same quality in a few years
  (20sec/sheet, faster)
• Pigment ink will be a standard in inkjet,any
  paper can be used

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Summary 2

• Background
• Why is the colour specification needed ?
• What are the problems in colour printing ?
• How to solve them ?
• Consequences and proposal

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General difficultiesWhy is the colour
specification needed ?

• - Even if spot colour printing used according to
  ISOM
• Different colours and qualities,between World
  Championships 2001, 2003, 2004 and 2005
• - Recently
• Spot colour printing is going to be dead now in
  printing market demand
• - In near future
• 4 colour process printing and personal printer
  printing by computer will be needed
  definitelyMUCH CHEAPER and USEFUL WAY!

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ISOM2000 Why is the colour specification needed ?

• Each C,M,Y,K ink is quite different from other
  printing ink, methods

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ISOM2010 draftWhy is the colour specification
needed ?

• - Secret draft Not uncovered even for MC members
  yet
• 3.5 PrintingAccurate colour printing should be
  realized for IOF events. Any printing method, eg
  spot colour printing, may be used, if colours and
  resolution have the same quality as the colour
  specification.

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ISOM2020 draftWhy the colour specification
needed ?

• - VERY secret draft Not revealed (even for MC
  members yet)
• 3.5 PrintingElectronic paper map must be used
  for IOF events. Other traditional methods, ex.
  map printing on paper, spotcolour ink printing,
  may be used, if colours and resolution have the
  same quality as the colour specification.

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General difficulties 2Why is the colour
specification needed ?

• - colour matching to spot colour ink
• It is very very difficult to reproduce exactly
  the same colour as spot colour pantone ink in-
  4colours process printing (ISOM2000)- personal
  printer printing (ISOM2010?) unless there is a
  more detailed colour specification

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Summary 3

• Background
• Why the colour specification needed ?
• What are the problems in colour printing ?
• How to solve them ?
• Consequences and proposal

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RGB value in OCAD no senseWhat are the
problems with colour printing ?

• - RGB value in OCAD

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RGB value in OCAD no senseWhat are the
problems in colour printing ?

• - RGB value in OCAD
• OCAD RGB value is uncalibrated / uncertain
• That RGB value only makes sense in relation to
  printer driver colour settings
• eg. more vivid graphic, more perceptual image,
  more monitor-like colours
• Each printer may reproduce rgb colour as it wants
  (according to its colour design).Sometimes big
  differences between even Canon and EPSON

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Colour blendingWhat are the problems in colour
printing ?
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Colour blendingWhat are the problems in colour
printing ?

• -Realizing overprinting effects in 2ways
• Blended colours difficult wayonly realized in
  high-level softwaresame as real printing
  (subtractive colours)
• Alpha channel blending easier way transparency
  effecthowever different from real ink
  printing(additive colours) OCAD goes with it
  now

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Summary 4

• Background
• Why is the colour specification needed ?
• What are the problems in colour printing ?
• How to solve them ?
• Consequences and proposal

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Colour space value specification How to solve
them ?

• Colour space value spec. (ex.sRGB, Lab..) will
  help for exact colour reproduction
• Use ICC colour matching system or
• Next generation CMS on PC will be available soon
• - printing sample goes with ICC

The colourSpecification
CMSon PC

-gt GOOD RESULTsame as spot colour
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Alpha blending colour needed How to solve them ?

• Alpha blending differs from real blending
• Real Blending Alpha blending
• HOWEVER, Alpha blending method may be used for
  common web, PDF, and easyprint

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Summary 5

• Background
• Why is the colour specification needed ?
• What are the problems in colour printing ?
• How to solve them ?
• Consequences and proposal

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Consequences and proposal 1

• - In order to realize colour printing by printer
  etc. in future
• Color space value specification of colors on
  o-map will be needed for next ISOM
• For printing practically,
• You need to use ICC colour matching system for
  nowor wait next CMS for a while

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Consequences and proposal 2

• - In order to realize overprint effects
• Alpha blending color specification may be needed
  in next ISOM
• More studies will be needed for both common use
  and high class print demand