Colour Printing

Kazushige HATORIIOF IT commission

WOC2005 mapper and so on..

Summary

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

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)

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

Summary 2

Background Why is the colour specification needed ? What are the problems in colour printing

? How to solve them ? Consequences and proposal

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 　 print

ing market demand- In near future ４ colour process printing and personal printer printin

g by computer will be needed definitelyMUCH CHEAPER and USEFUL WAY!

ISOM2000 Why is the colour specification needed ?

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

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.

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.

General difficulties 2Why is the colour specification needed ?

- colour matching to spot colour ink It is very very difficult to reproduce exact

ly 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

Summary 3

Background Why the colour specification needed ? What are the problems in colour printing

? How to solve them ? Consequences and proposal

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

- RGB value in OCAD

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 pri

nter driver colour settings eg. more vivid graphic, more perceptual image, mor

e 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

Colour blendingWhat are the problems in colour printing ?

Colour blendingWhat are the problems in colour printing ?

-Realizing overprinting effects in 2ways Blended colours – difficult way

only 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

Summary 4

Background Why is the colour specification needed ? What are the problems in colour printing

? How to solve them ? Consequences and proposal

Colour space value specification How to solve them ?

Colour space value spec. (ex.sRGB, L*a*b*..) will help for exact colour reproduction

Use ICC colour matching system or Next generation CMS on PC will be available s

oon- printing sample goes with ICC

The colourSpecification +

CMSon PC

-> GOOD RESULTsame as spot colour

- Alpha blending differs from real blending

- Real Blending Alpha blendingHOWEVER, Alpha blending method may be use

d for common web, PDF, and easyprint

Alpha blending colour needed How to solve them ?

Summary 5

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

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 now

or wait next CMS for a while

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