SlideShare a Scribd company logo
1 of 35
Download to read offline
Colour matching
and
colour theory
An introduction to Computer
Aided Colour Management
For the Injection Moulder

Siddhartha Roy

1
•Special thanks to Mr. V. C. Gupte for
p
p
elaborating and educating us on ‘Colour
g
Measurement’ and ‘Colour Management’.

• A major part of this presentation covers the
concepts and theories taught by him to our
team at V.I.P. Industries.
• I would like to record my appreciation to his
contribution.
Importance of Colours in
Mouldings
• Aesthetics are as important as Physical properties in
mouldings.
• Th ability to integrally colour Plastic Moulded
The bilit t i t
ll
l
Pl ti M ld d
articles is an important edge over other materials
like metals and even Rubber.
• Matching of colours, especially across assembled
mouldings is crucial in many applications.
• The task becomes more difficult when colours need
to be exactly matched with different Polymers.
• Understanding Colour theory and its applications
has become a must for the Injection Moulder.
3
Trends in Colouring
• More and more Auto Interiors, Appliances
and other Plastic assemblies will be
requiring exact colour matched components

4
Components must have the same colour even
when
•
•
•
•

Moulded at different Vendors/ Locations
Moulded from different Plastics
Moulded with addition of regrind.
Moulded from different lots of Resin/ Masterbatch

5
Perception of colour

• The Light source
•The object
j
•The human eye
Th h
6
The Human Eye and Brain
• Light receptors
– Rods - Perceives light and darkness
– Cones-Perceive Colours

• Rods
– The black & white world. (Night vision)

• C
Cones
– Red, Green & Blue sensitive receptors

• The optic nerves transmits stimuli to the
brain which interprets colour.

7
Optical Overload
• There is a mismatch between the large number of
rods and cones in the retina and the transmitters to
the brain.
• This results in false perception of colour
especially when the eye is exposed to bright
i ll h h
i
d bi h
images for a length of time.
• I the next slide concentrate on the central white
In th
t lid
t t
th
t l hit
dot for 30 seconds.
• Ob
Observe what happens when the screen turns
h th
h th
t
white.
9
Colour matching and colour theory
Even Black and white images can
give strange results
Optical Illusions
Colour matching and colour theory
• The optical illusions can be resolved by
actual measurements by simple instruments
like a measuring scale, Compass etc.
Need for Quantifying Colours
• Like in the previous examples we need a
system for measuring and quantifying
colours..
colours
• Subjectivity in Colour perceptions is
common
– All brains do not process Colour information
identically.
identically
– Prime example is Colour blindness- Inability to
distinguish between Red and Green.
Green
15
Colour Theory
• A Standardised scientific method is required
to record Colour Information.
• Two of the major Colour quantification
systems are

–Munsell Colour Theory
–The CIE Theory
The Munsell Colour Theory

17
Definitions
• Hue- An attribute by which a sample
appears to be similar to one or a mixture of
two of the perceived colours –red, yellow,
green and blue.
• Chroma- Is the colourfulness of a given
illuminance level.
• Value- The lightness or darkness, i.e. the
attribute by which a sample appears to
reflect a greater or smaller fraction of the
fl t
t
ll f ti
f th
incident light.
The CIE Theory
Standard Illuminants

Red
Standard Observer
Magenta

Yellow
Y ll

Green

White
Cyan

Blue
19
CIE Colour Specifications:
• XYZ Tristimulus Values
• LabCh

20
Computerised Colour
Measurement
• Spectrophotometers are very effective in
measuring and recording Colours
• The CIE System is commonly used
• Software is crucial in recording, analysing,
recording analysing
comparing and matching colour samples.
• Samples should have the same surface finish
and shape as far as possible.
• The S
h Spectrophotometer scans samples f
h
l for
comparison and the Software takes over. 21
Colour Difference
• dE = (LabCh of sample)-(LabCh of Standard)
(L bCh f
l ) (L bCh f St d d)
– dL- When positive -- lighter negative-- darker
lighter,
darker.
– da- When positive-- redder, negative-- greener
– db- When positive-- yellower, negative-- bluer
– dC-When positive-- brighter, negative-- duller
– dh Indicated hue address
dh- di
dh
dd
22
Colour differenceColour on Screen

Batch 1
Standard
Batch 2

23
Colour DifferenceL a b Plot

24
Colour Strength

25
Pass - Fail

26
Formulation

27
Batch Correction

28
Recap

29
Pigment Database
• The effectiveness of the Spectrophotometer
– Colour Matching software is very
dependant on the Pigment Database loaded.
loaded
• The LabCh values for each pigment being
used h to b painstakingly generated
d has be i
ki l
d
– In full strength and white and black reduction.
– On the different Polymer bases (PO, Styrenic,
PVC etc.)
– Some Pigment manufacturers provide such
30
data.
Important Aspects for Colouring
of Plastics
• Pigments should be thoroughly dispersed
– Very difficult with powder pigments
– Much easier with Masterbatches

• Colour of base plastic
– Colourability of different plastics vary widely
– Masterbatch selection should be appropriate to base
plastic
•
•
•
•

Polyolefin base
Styrenic base
PVC base
Universal base

31
Major Causes of Colour
Variation
• Weighing and mixing of colourants.
– Cleanliness of Blending Equipment
– Adequate mixing time

• Interference from regrind. Contamination.
• Degradation during processing.
– Machine stoppages and inadequate purging.

• Improper selection of Colourant/ Masterbatch.
• Interference with processing additives
– E.G. With PVC chrome pigments containing lead will
32
discolour if Tin Stabilisers are present.
How to Face the Challenge?
• Accent on cleanliness
– Poor housekeeping = colour contamination

• Selecting correct Colourant
– Clear understanding of colour behaviour in Polymer
involved. Masterbatch supplier plays crucial role.

• Use of Precoloured Materials (esp ABS PC/ABS)
ABS,
– Best for replicating same colours at different locations
– Cost is more
– Inventory and logistics issues

• Use of Pigment colouring for small quantities
where M t b t h development is not feasible
h Masterbatch d l
ti
t f ibl
• Making use of Colour matching facilities.

33
For more Info on Colour Theory:
• http://www.premiercolorscan.com/color_theory/colo
r_theory.htm
y
• http://www hunterlab com/ColorEducation/ColorTh
http://www.hunterlab.com/ColorEducation/ColorTh
eory

34
Email: royplastech@rediffmail.com

35

Mobile: 9890366632

More Related Content

What's hot

Recent advances in desizing, scouring and bleaching
Recent advances in desizing, scouring and bleachingRecent advances in desizing, scouring and bleaching
Recent advances in desizing, scouring and bleachingBahirdar University
 
Viscosity of different printing paste
Viscosity of different printing pasteViscosity of different printing paste
Viscosity of different printing pasteAdya Tiwari
 
Dyeing of acrylic fibre
Dyeing of acrylic fibreDyeing of acrylic fibre
Dyeing of acrylic fibreAdane Nega
 
Dyeing of polyester and cotton blends
Dyeing of polyester and cotton blendsDyeing of polyester and cotton blends
Dyeing of polyester and cotton blendsAshish Dua
 
Wet Testing of textile materials
Wet Testing of textile materialsWet Testing of textile materials
Wet Testing of textile materialsAzmir Latif Beg
 
Pigment printing
Pigment printingPigment printing
Pigment printingAdane Nega
 
1 chemical processing.ppt
1 chemical processing.ppt1 chemical processing.ppt
1 chemical processing.pptROHIT SINGH
 
PROJECT : REACTION MECHANISM OF REACTIVE DYES IN ON CELLULOSE FIBER.
PROJECT  : REACTION MECHANISM OF  REACTIVE DYES IN  ON CELLULOSE FIBER.PROJECT  : REACTION MECHANISM OF  REACTIVE DYES IN  ON CELLULOSE FIBER.
PROJECT : REACTION MECHANISM OF REACTIVE DYES IN ON CELLULOSE FIBER.Md. Mazadul Hasan Shishir
 
Measurement of colour
Measurement of colourMeasurement of colour
Measurement of colourSappiHouston
 
''Presentation On Disperse Dye''
''Presentation On Disperse Dye''''Presentation On Disperse Dye''
''Presentation On Disperse Dye''Khan. Ataur Rahman
 
Different color theory
Different color theoryDifferent color theory
Different color theorytareq hasan
 
Water free dyeing technology
Water free dyeing technologyWater free dyeing technology
Water free dyeing technologySalman Zaki
 

What's hot (20)

Colour fastness
Colour fastnessColour fastness
Colour fastness
 
Fastness testing of fabric
Fastness testing  of fabric Fastness testing  of fabric
Fastness testing of fabric
 
Recent advances in desizing, scouring and bleaching
Recent advances in desizing, scouring and bleachingRecent advances in desizing, scouring and bleaching
Recent advances in desizing, scouring and bleaching
 
Viscosity of different printing paste
Viscosity of different printing pasteViscosity of different printing paste
Viscosity of different printing paste
 
Bleaching process
Bleaching processBleaching process
Bleaching process
 
DIRECT DYE
DIRECT DYEDIRECT DYE
DIRECT DYE
 
Dyeing of acrylic fibre
Dyeing of acrylic fibreDyeing of acrylic fibre
Dyeing of acrylic fibre
 
Dyeing of polyester and cotton blends
Dyeing of polyester and cotton blendsDyeing of polyester and cotton blends
Dyeing of polyester and cotton blends
 
Wet Testing of textile materials
Wet Testing of textile materialsWet Testing of textile materials
Wet Testing of textile materials
 
Pigment printing
Pigment printingPigment printing
Pigment printing
 
Color matching cabinet
Color matching cabinetColor matching cabinet
Color matching cabinet
 
Dyeing parameter
Dyeing parameterDyeing parameter
Dyeing parameter
 
1 chemical processing.ppt
1 chemical processing.ppt1 chemical processing.ppt
1 chemical processing.ppt
 
Optical brightening Agent
Optical brightening Agent Optical brightening Agent
Optical brightening Agent
 
PROJECT : REACTION MECHANISM OF REACTIVE DYES IN ON CELLULOSE FIBER.
PROJECT  : REACTION MECHANISM OF  REACTIVE DYES IN  ON CELLULOSE FIBER.PROJECT  : REACTION MECHANISM OF  REACTIVE DYES IN  ON CELLULOSE FIBER.
PROJECT : REACTION MECHANISM OF REACTIVE DYES IN ON CELLULOSE FIBER.
 
Textile chemical Dictionary
Textile chemical Dictionary Textile chemical Dictionary
Textile chemical Dictionary
 
Measurement of colour
Measurement of colourMeasurement of colour
Measurement of colour
 
''Presentation On Disperse Dye''
''Presentation On Disperse Dye''''Presentation On Disperse Dye''
''Presentation On Disperse Dye''
 
Different color theory
Different color theoryDifferent color theory
Different color theory
 
Water free dyeing technology
Water free dyeing technologyWater free dyeing technology
Water free dyeing technology
 

Similar to Colour matching and colour theory

Colour technology
Colour technologyColour technology
Colour technologyJunaid Khan
 
Chapter 5 - Color and Dyeing.pptx
Chapter 5 - Color and Dyeing.pptxChapter 5 - Color and Dyeing.pptx
Chapter 5 - Color and Dyeing.pptxNguynMinhTun45
 
Digibury: Martin Jewiss - Colour, Creativity and Running Away
Digibury: Martin Jewiss - Colour, Creativity and Running AwayDigibury: Martin Jewiss - Colour, Creativity and Running Away
Digibury: Martin Jewiss - Colour, Creativity and Running AwayLizzieHodgson
 
Paper Con 2011 Presentation Continuous Coloration Of Coatings For Coated Pa...
Paper Con 2011 Presentation   Continuous Coloration Of Coatings For Coated Pa...Paper Con 2011 Presentation   Continuous Coloration Of Coatings For Coated Pa...
Paper Con 2011 Presentation Continuous Coloration Of Coatings For Coated Pa...Mark Crable
 
ROLE OF COMPUTER IN TEXTILE
ROLE OF COMPUTER IN TEXTILEROLE OF COMPUTER IN TEXTILE
ROLE OF COMPUTER IN TEXTILEItiDubey3
 
What Color is Solid State Lighting - Panel Discussion
What Color is Solid State Lighting - Panel DiscussionWhat Color is Solid State Lighting - Panel Discussion
What Color is Solid State Lighting - Panel DiscussionCindy Foster-Warthen
 
Pbj Painting | Painting a house
Pbj Painting | Painting a house Pbj Painting | Painting a house
Pbj Painting | Painting a house pbjpainting
 
Franziska Frey 2 / DHV13
Franziska Frey 2 / DHV13Franziska Frey 2 / DHV13
Franziska Frey 2 / DHV13Frederic Kaplan
 
7. introduction to dyeing
7. introduction to dyeing7. introduction to dyeing
7. introduction to dyeingRinku Shemar
 
Game Design 2: Lecture 11 - Colour
Game Design 2: Lecture 11 - ColourGame Design 2: Lecture 11 - Colour
Game Design 2: Lecture 11 - ColourDavid Farrell
 
Webinar -- G7 for Grand Format Printers
Webinar -- G7 for Grand Format PrintersWebinar -- G7 for Grand Format Printers
Webinar -- G7 for Grand Format PrintersRPimaging, INC
 

Similar to Colour matching and colour theory (20)

TITA
TITATITA
TITA
 
Colour technology
Colour technologyColour technology
Colour technology
 
Chapter 5 - Color and Dyeing.pptx
Chapter 5 - Color and Dyeing.pptxChapter 5 - Color and Dyeing.pptx
Chapter 5 - Color and Dyeing.pptx
 
Digibury: Martin Jewiss - Colour, Creativity and Running Away
Digibury: Martin Jewiss - Colour, Creativity and Running AwayDigibury: Martin Jewiss - Colour, Creativity and Running Away
Digibury: Martin Jewiss - Colour, Creativity and Running Away
 
Paper Con 2011 Presentation Continuous Coloration Of Coatings For Coated Pa...
Paper Con 2011 Presentation   Continuous Coloration Of Coatings For Coated Pa...Paper Con 2011 Presentation   Continuous Coloration Of Coatings For Coated Pa...
Paper Con 2011 Presentation Continuous Coloration Of Coatings For Coated Pa...
 
ROLE OF COMPUTER IN TEXTILE
ROLE OF COMPUTER IN TEXTILEROLE OF COMPUTER IN TEXTILE
ROLE OF COMPUTER IN TEXTILE
 
Chapter 11
Chapter 11Chapter 11
Chapter 11
 
Introduction - Solid Color
Introduction - Solid ColorIntroduction - Solid Color
Introduction - Solid Color
 
Mambo
MamboMambo
Mambo
 
What Color is Solid State Lighting - Panel Discussion
What Color is Solid State Lighting - Panel DiscussionWhat Color is Solid State Lighting - Panel Discussion
What Color is Solid State Lighting - Panel Discussion
 
Chapter11
Chapter11Chapter11
Chapter11
 
Pbj Painting | Painting a house
Pbj Painting | Painting a house Pbj Painting | Painting a house
Pbj Painting | Painting a house
 
Franziska Frey 2 / DHV13
Franziska Frey 2 / DHV13Franziska Frey 2 / DHV13
Franziska Frey 2 / DHV13
 
7. introduction to dyeing
7. introduction to dyeing7. introduction to dyeing
7. introduction to dyeing
 
Pro active management of visual appearance of products
Pro active management of visual appearance of productsPro active management of visual appearance of products
Pro active management of visual appearance of products
 
Colour management
Colour managementColour management
Colour management
 
Game Design 2: Lecture 11 - Colour
Game Design 2: Lecture 11 - ColourGame Design 2: Lecture 11 - Colour
Game Design 2: Lecture 11 - Colour
 
Webinar -- G7 for Grand Format Printers
Webinar -- G7 for Grand Format PrintersWebinar -- G7 for Grand Format Printers
Webinar -- G7 for Grand Format Printers
 
Textgraphics1
Textgraphics1Textgraphics1
Textgraphics1
 
Image analytics - A Primer
Image analytics - A PrimerImage analytics - A Primer
Image analytics - A Primer
 

More from Siddhartha Roy

Plastic applications with high ca co3 content1
Plastic applications with high ca co3 content1 Plastic applications with high ca co3 content1
Plastic applications with high ca co3 content1 Siddhartha Roy
 
Development of one pack stabiliser systems
Development of one pack stabiliser systemsDevelopment of one pack stabiliser systems
Development of one pack stabiliser systemsSiddhartha Roy
 
Pvc pipes past present and future 6 Slide handouts in PDF Format
Pvc pipes past present and future 6 Slide handouts in PDF FormatPvc pipes past present and future 6 Slide handouts in PDF Format
Pvc pipes past present and future 6 Slide handouts in PDF FormatSiddhartha Roy
 
Pvc pipes in India, past present and future
Pvc pipes in India, past present and futurePvc pipes in India, past present and future
Pvc pipes in India, past present and futureSiddhartha Roy
 
Powerpoint Training - Ten golden rules for making effective Presentations
Powerpoint Training - Ten golden rules for making effective PresentationsPowerpoint Training - Ten golden rules for making effective Presentations
Powerpoint Training - Ten golden rules for making effective PresentationsSiddhartha Roy
 
PVC volume cost, How to use Fillers judicously
PVC volume cost, How to use Fillers judicouslyPVC volume cost, How to use Fillers judicously
PVC volume cost, How to use Fillers judicouslySiddhartha Roy
 
Pvc compounding ingredients, The essential Ingredients
Pvc compounding ingredients, The essential IngredientsPvc compounding ingredients, The essential Ingredients
Pvc compounding ingredients, The essential IngredientsSiddhartha Roy
 
GCC in PVC, More than a Pipe dream
GCC in PVC, More than a Pipe dreamGCC in PVC, More than a Pipe dream
GCC in PVC, More than a Pipe dreamSiddhartha Roy
 
Volume Costs in Plastic Applications
Volume Costs in Plastic ApplicationsVolume Costs in Plastic Applications
Volume Costs in Plastic ApplicationsSiddhartha Roy
 
Calcium Carbonate's Polymer Promise
Calcium Carbonate's Polymer PromiseCalcium Carbonate's Polymer Promise
Calcium Carbonate's Polymer PromiseSiddhartha Roy
 
PVC Compounding Ingredients Part 1
PVC Compounding Ingredients Part 1PVC Compounding Ingredients Part 1
PVC Compounding Ingredients Part 1Siddhartha Roy
 
Volume Cost concept with reference to Filled Polyolefins
Volume Cost concept with reference to Filled PolyolefinsVolume Cost concept with reference to Filled Polyolefins
Volume Cost concept with reference to Filled PolyolefinsSiddhartha Roy
 

More from Siddhartha Roy (12)

Plastic applications with high ca co3 content1
Plastic applications with high ca co3 content1 Plastic applications with high ca co3 content1
Plastic applications with high ca co3 content1
 
Development of one pack stabiliser systems
Development of one pack stabiliser systemsDevelopment of one pack stabiliser systems
Development of one pack stabiliser systems
 
Pvc pipes past present and future 6 Slide handouts in PDF Format
Pvc pipes past present and future 6 Slide handouts in PDF FormatPvc pipes past present and future 6 Slide handouts in PDF Format
Pvc pipes past present and future 6 Slide handouts in PDF Format
 
Pvc pipes in India, past present and future
Pvc pipes in India, past present and futurePvc pipes in India, past present and future
Pvc pipes in India, past present and future
 
Powerpoint Training - Ten golden rules for making effective Presentations
Powerpoint Training - Ten golden rules for making effective PresentationsPowerpoint Training - Ten golden rules for making effective Presentations
Powerpoint Training - Ten golden rules for making effective Presentations
 
PVC volume cost, How to use Fillers judicously
PVC volume cost, How to use Fillers judicouslyPVC volume cost, How to use Fillers judicously
PVC volume cost, How to use Fillers judicously
 
Pvc compounding ingredients, The essential Ingredients
Pvc compounding ingredients, The essential IngredientsPvc compounding ingredients, The essential Ingredients
Pvc compounding ingredients, The essential Ingredients
 
GCC in PVC, More than a Pipe dream
GCC in PVC, More than a Pipe dreamGCC in PVC, More than a Pipe dream
GCC in PVC, More than a Pipe dream
 
Volume Costs in Plastic Applications
Volume Costs in Plastic ApplicationsVolume Costs in Plastic Applications
Volume Costs in Plastic Applications
 
Calcium Carbonate's Polymer Promise
Calcium Carbonate's Polymer PromiseCalcium Carbonate's Polymer Promise
Calcium Carbonate's Polymer Promise
 
PVC Compounding Ingredients Part 1
PVC Compounding Ingredients Part 1PVC Compounding Ingredients Part 1
PVC Compounding Ingredients Part 1
 
Volume Cost concept with reference to Filled Polyolefins
Volume Cost concept with reference to Filled PolyolefinsVolume Cost concept with reference to Filled Polyolefins
Volume Cost concept with reference to Filled Polyolefins
 

Recently uploaded

NewBase 14 March 2024 Energy News issue - 1707 by Khaled Al Awadi_compress...
NewBase  14 March  2024  Energy News issue - 1707 by Khaled Al Awadi_compress...NewBase  14 March  2024  Energy News issue - 1707 by Khaled Al Awadi_compress...
NewBase 14 March 2024 Energy News issue - 1707 by Khaled Al Awadi_compress...Khaled Al Awadi
 
A Comprehensive Case Study on the IL&FS Crisis (final).pptx
A Comprehensive Case Study on the IL&FS Crisis (final).pptxA Comprehensive Case Study on the IL&FS Crisis (final).pptx
A Comprehensive Case Study on the IL&FS Crisis (final).pptxShainaMaheshwari1
 
Wallet Pitch for startup fintech and loan
Wallet Pitch for startup fintech and loanWallet Pitch for startup fintech and loan
Wallet Pitch for startup fintech and loansujat8807
 
Shopclues: Failure & Solutions in Business Model
Shopclues: Failure & Solutions in Business ModelShopclues: Failure & Solutions in Business Model
Shopclues: Failure & Solutions in Business ModelBhaviniSharma12
 
We are inviting you on board, to move forward together in the Right Direction
We are inviting you on board, to move forward together in the Right DirectionWe are inviting you on board, to move forward together in the Right Direction
We are inviting you on board, to move forward together in the Right DirectionRight Direction Aero
 
Presented by Sabri international .......
Presented by Sabri international .......Presented by Sabri international .......
Presented by Sabri international .......SABRI INTERNATIONAL
 
The Vietnam Believer_Newsletter_Vol.001_Mar12 2024
The Vietnam Believer_Newsletter_Vol.001_Mar12 2024The Vietnam Believer_Newsletter_Vol.001_Mar12 2024
The Vietnam Believer_Newsletter_Vol.001_Mar12 2024believeminhh
 
Green Innovations: Wristbands Ireland's Eco-Friendly Products
Green Innovations: Wristbands Ireland's Eco-Friendly ProductsGreen Innovations: Wristbands Ireland's Eco-Friendly Products
Green Innovations: Wristbands Ireland's Eco-Friendly ProductsWristbands Ireland
 
PHX Corporate Presentation March 2024 Final
PHX Corporate Presentation March 2024 FinalPHX Corporate Presentation March 2024 Final
PHX Corporate Presentation March 2024 FinalPanhandleOilandGas
 
Strategic Resources Corporate Presentation - March 2024 Update
Strategic Resources Corporate Presentation - March 2024 UpdateStrategic Resources Corporate Presentation - March 2024 Update
Strategic Resources Corporate Presentation - March 2024 UpdateAdnet Communications
 
Digital Marketing Training Program skills s
Digital Marketing Training Program skills sDigital Marketing Training Program skills s
Digital Marketing Training Program skills sgodxzyrox
 
Bus Eth ch3 ppt.ppt business ethics and corporate social responsibilities ppt
Bus Eth ch3 ppt.ppt business ethics and corporate social responsibilities pptBus Eth ch3 ppt.ppt business ethics and corporate social responsibilities ppt
Bus Eth ch3 ppt.ppt business ethics and corporate social responsibilities pptendeworku
 
ICv2 Hobby Games White Paper 2024 - State of the Industry
ICv2 Hobby Games White Paper 2024 - State of the IndustryICv2 Hobby Games White Paper 2024 - State of the Industry
ICv2 Hobby Games White Paper 2024 - State of the IndustryDennisViau
 
Business Models and Business Model Innovation
Business Models and Business Model InnovationBusiness Models and Business Model Innovation
Business Models and Business Model InnovationMichal Hron
 
NVIDIA's overall business overview Presentation.pptx
NVIDIA's overall business overview Presentation.pptxNVIDIA's overall business overview Presentation.pptx
NVIDIA's overall business overview Presentation.pptxKrutik Rakade
 
0311 National Accounts Online Giving Trends.pdf
0311 National Accounts Online Giving Trends.pdf0311 National Accounts Online Giving Trends.pdf
0311 National Accounts Online Giving Trends.pdfBloomerang
 
Benihana of Tokyo case study11111111.pdf
Benihana of Tokyo case study11111111.pdfBenihana of Tokyo case study11111111.pdf
Benihana of Tokyo case study11111111.pdfjavenxxx01
 
CORPORATE SOCIAL RESPONSIBILITY - FINAL REQUIREMENT.pdf
CORPORATE SOCIAL RESPONSIBILITY - FINAL REQUIREMENT.pdfCORPORATE SOCIAL RESPONSIBILITY - FINAL REQUIREMENT.pdf
CORPORATE SOCIAL RESPONSIBILITY - FINAL REQUIREMENT.pdfLouis Malaybalay
 
Reframing Requirements: A Strategic Approach to Requirement Definition, with ...
Reframing Requirements: A Strategic Approach to Requirement Definition, with ...Reframing Requirements: A Strategic Approach to Requirement Definition, with ...
Reframing Requirements: A Strategic Approach to Requirement Definition, with ...Jake Truemper
 

Recently uploaded (20)

NewBase 14 March 2024 Energy News issue - 1707 by Khaled Al Awadi_compress...
NewBase  14 March  2024  Energy News issue - 1707 by Khaled Al Awadi_compress...NewBase  14 March  2024  Energy News issue - 1707 by Khaled Al Awadi_compress...
NewBase 14 March 2024 Energy News issue - 1707 by Khaled Al Awadi_compress...
 
A Comprehensive Case Study on the IL&FS Crisis (final).pptx
A Comprehensive Case Study on the IL&FS Crisis (final).pptxA Comprehensive Case Study on the IL&FS Crisis (final).pptx
A Comprehensive Case Study on the IL&FS Crisis (final).pptx
 
Wallet Pitch for startup fintech and loan
Wallet Pitch for startup fintech and loanWallet Pitch for startup fintech and loan
Wallet Pitch for startup fintech and loan
 
Shopclues: Failure & Solutions in Business Model
Shopclues: Failure & Solutions in Business ModelShopclues: Failure & Solutions in Business Model
Shopclues: Failure & Solutions in Business Model
 
We are inviting you on board, to move forward together in the Right Direction
We are inviting you on board, to move forward together in the Right DirectionWe are inviting you on board, to move forward together in the Right Direction
We are inviting you on board, to move forward together in the Right Direction
 
Presented by Sabri international .......
Presented by Sabri international .......Presented by Sabri international .......
Presented by Sabri international .......
 
The Vietnam Believer_Newsletter_Vol.001_Mar12 2024
The Vietnam Believer_Newsletter_Vol.001_Mar12 2024The Vietnam Believer_Newsletter_Vol.001_Mar12 2024
The Vietnam Believer_Newsletter_Vol.001_Mar12 2024
 
Green Innovations: Wristbands Ireland's Eco-Friendly Products
Green Innovations: Wristbands Ireland's Eco-Friendly ProductsGreen Innovations: Wristbands Ireland's Eco-Friendly Products
Green Innovations: Wristbands Ireland's Eco-Friendly Products
 
PHX Corporate Presentation March 2024 Final
PHX Corporate Presentation March 2024 FinalPHX Corporate Presentation March 2024 Final
PHX Corporate Presentation March 2024 Final
 
Strategic Resources Corporate Presentation - March 2024 Update
Strategic Resources Corporate Presentation - March 2024 UpdateStrategic Resources Corporate Presentation - March 2024 Update
Strategic Resources Corporate Presentation - March 2024 Update
 
WAM Corporate Presentation Mar 12 2024_Video.pdf
WAM Corporate Presentation Mar 12 2024_Video.pdfWAM Corporate Presentation Mar 12 2024_Video.pdf
WAM Corporate Presentation Mar 12 2024_Video.pdf
 
Digital Marketing Training Program skills s
Digital Marketing Training Program skills sDigital Marketing Training Program skills s
Digital Marketing Training Program skills s
 
Bus Eth ch3 ppt.ppt business ethics and corporate social responsibilities ppt
Bus Eth ch3 ppt.ppt business ethics and corporate social responsibilities pptBus Eth ch3 ppt.ppt business ethics and corporate social responsibilities ppt
Bus Eth ch3 ppt.ppt business ethics and corporate social responsibilities ppt
 
ICv2 Hobby Games White Paper 2024 - State of the Industry
ICv2 Hobby Games White Paper 2024 - State of the IndustryICv2 Hobby Games White Paper 2024 - State of the Industry
ICv2 Hobby Games White Paper 2024 - State of the Industry
 
Business Models and Business Model Innovation
Business Models and Business Model InnovationBusiness Models and Business Model Innovation
Business Models and Business Model Innovation
 
NVIDIA's overall business overview Presentation.pptx
NVIDIA's overall business overview Presentation.pptxNVIDIA's overall business overview Presentation.pptx
NVIDIA's overall business overview Presentation.pptx
 
0311 National Accounts Online Giving Trends.pdf
0311 National Accounts Online Giving Trends.pdf0311 National Accounts Online Giving Trends.pdf
0311 National Accounts Online Giving Trends.pdf
 
Benihana of Tokyo case study11111111.pdf
Benihana of Tokyo case study11111111.pdfBenihana of Tokyo case study11111111.pdf
Benihana of Tokyo case study11111111.pdf
 
CORPORATE SOCIAL RESPONSIBILITY - FINAL REQUIREMENT.pdf
CORPORATE SOCIAL RESPONSIBILITY - FINAL REQUIREMENT.pdfCORPORATE SOCIAL RESPONSIBILITY - FINAL REQUIREMENT.pdf
CORPORATE SOCIAL RESPONSIBILITY - FINAL REQUIREMENT.pdf
 
Reframing Requirements: A Strategic Approach to Requirement Definition, with ...
Reframing Requirements: A Strategic Approach to Requirement Definition, with ...Reframing Requirements: A Strategic Approach to Requirement Definition, with ...
Reframing Requirements: A Strategic Approach to Requirement Definition, with ...
 

Colour matching and colour theory

  • 1. Colour matching and colour theory An introduction to Computer Aided Colour Management For the Injection Moulder Siddhartha Roy 1
  • 2. •Special thanks to Mr. V. C. Gupte for p p elaborating and educating us on ‘Colour g Measurement’ and ‘Colour Management’. • A major part of this presentation covers the concepts and theories taught by him to our team at V.I.P. Industries. • I would like to record my appreciation to his contribution.
  • 3. Importance of Colours in Mouldings • Aesthetics are as important as Physical properties in mouldings. • Th ability to integrally colour Plastic Moulded The bilit t i t ll l Pl ti M ld d articles is an important edge over other materials like metals and even Rubber. • Matching of colours, especially across assembled mouldings is crucial in many applications. • The task becomes more difficult when colours need to be exactly matched with different Polymers. • Understanding Colour theory and its applications has become a must for the Injection Moulder. 3
  • 4. Trends in Colouring • More and more Auto Interiors, Appliances and other Plastic assemblies will be requiring exact colour matched components 4
  • 5. Components must have the same colour even when • • • • Moulded at different Vendors/ Locations Moulded from different Plastics Moulded with addition of regrind. Moulded from different lots of Resin/ Masterbatch 5
  • 6. Perception of colour • The Light source •The object j •The human eye Th h 6
  • 7. The Human Eye and Brain • Light receptors – Rods - Perceives light and darkness – Cones-Perceive Colours • Rods – The black & white world. (Night vision) • C Cones – Red, Green & Blue sensitive receptors • The optic nerves transmits stimuli to the brain which interprets colour. 7
  • 8. Optical Overload • There is a mismatch between the large number of rods and cones in the retina and the transmitters to the brain. • This results in false perception of colour especially when the eye is exposed to bright i ll h h i d bi h images for a length of time. • I the next slide concentrate on the central white In th t lid t t th t l hit dot for 30 seconds. • Ob Observe what happens when the screen turns h th h th t white.
  • 9. 9
  • 11. Even Black and white images can give strange results
  • 14. • The optical illusions can be resolved by actual measurements by simple instruments like a measuring scale, Compass etc.
  • 15. Need for Quantifying Colours • Like in the previous examples we need a system for measuring and quantifying colours.. colours • Subjectivity in Colour perceptions is common – All brains do not process Colour information identically. identically – Prime example is Colour blindness- Inability to distinguish between Red and Green. Green 15
  • 16. Colour Theory • A Standardised scientific method is required to record Colour Information. • Two of the major Colour quantification systems are –Munsell Colour Theory –The CIE Theory
  • 17. The Munsell Colour Theory 17
  • 18. Definitions • Hue- An attribute by which a sample appears to be similar to one or a mixture of two of the perceived colours –red, yellow, green and blue. • Chroma- Is the colourfulness of a given illuminance level. • Value- The lightness or darkness, i.e. the attribute by which a sample appears to reflect a greater or smaller fraction of the fl t t ll f ti f th incident light.
  • 19. The CIE Theory Standard Illuminants Red Standard Observer Magenta Yellow Y ll Green White Cyan Blue 19
  • 20. CIE Colour Specifications: • XYZ Tristimulus Values • LabCh 20
  • 21. Computerised Colour Measurement • Spectrophotometers are very effective in measuring and recording Colours • The CIE System is commonly used • Software is crucial in recording, analysing, recording analysing comparing and matching colour samples. • Samples should have the same surface finish and shape as far as possible. • The S h Spectrophotometer scans samples f h l for comparison and the Software takes over. 21
  • 22. Colour Difference • dE = (LabCh of sample)-(LabCh of Standard) (L bCh f l ) (L bCh f St d d) – dL- When positive -- lighter negative-- darker lighter, darker. – da- When positive-- redder, negative-- greener – db- When positive-- yellower, negative-- bluer – dC-When positive-- brighter, negative-- duller – dh Indicated hue address dh- di dh dd 22
  • 23. Colour differenceColour on Screen Batch 1 Standard Batch 2 23
  • 24. Colour DifferenceL a b Plot 24
  • 30. Pigment Database • The effectiveness of the Spectrophotometer – Colour Matching software is very dependant on the Pigment Database loaded. loaded • The LabCh values for each pigment being used h to b painstakingly generated d has be i ki l d – In full strength and white and black reduction. – On the different Polymer bases (PO, Styrenic, PVC etc.) – Some Pigment manufacturers provide such 30 data.
  • 31. Important Aspects for Colouring of Plastics • Pigments should be thoroughly dispersed – Very difficult with powder pigments – Much easier with Masterbatches • Colour of base plastic – Colourability of different plastics vary widely – Masterbatch selection should be appropriate to base plastic • • • • Polyolefin base Styrenic base PVC base Universal base 31
  • 32. Major Causes of Colour Variation • Weighing and mixing of colourants. – Cleanliness of Blending Equipment – Adequate mixing time • Interference from regrind. Contamination. • Degradation during processing. – Machine stoppages and inadequate purging. • Improper selection of Colourant/ Masterbatch. • Interference with processing additives – E.G. With PVC chrome pigments containing lead will 32 discolour if Tin Stabilisers are present.
  • 33. How to Face the Challenge? • Accent on cleanliness – Poor housekeeping = colour contamination • Selecting correct Colourant – Clear understanding of colour behaviour in Polymer involved. Masterbatch supplier plays crucial role. • Use of Precoloured Materials (esp ABS PC/ABS) ABS, – Best for replicating same colours at different locations – Cost is more – Inventory and logistics issues • Use of Pigment colouring for small quantities where M t b t h development is not feasible h Masterbatch d l ti t f ibl • Making use of Colour matching facilities. 33
  • 34. For more Info on Colour Theory: • http://www.premiercolorscan.com/color_theory/colo r_theory.htm y • http://www hunterlab com/ColorEducation/ColorTh http://www.hunterlab.com/ColorEducation/ColorTh eory 34