Introduction to Colour Concepts

8/7/2019 Introduction to Colour Concepts

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AnIntroduction to

ColourConcepts

P2010 Carlo Mostacci


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1

HSB Colour Model

TheHue, SaturationandBrightnesscolour model

allows artists to make creative colour selections.

Saturation

BrightnessHue


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2

RGB Colour Model

RGBstands orRED, GREENandBLUE. This colour model is

also known as theAdditive Colour Modeland governs the

behaviour o direct light.


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3

CMYK Colour Model

CMYKstands orCYAN, MAGENTA, YELLOWandGREEN.

This colour model is also known as theSubtractive Colour

Modeland governs the behaviour o reected light.


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Additive & Subtractive Colour

The Additive and Subtractive Colour Models are essentiallyinverses o one anotherAdditive Colour (RBG) is used on the

internet and Subtractive Colour (CMYK) is used or printing.


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5

CIE L*a*b* Colour Model

TheCIE L*A*B*colour model is an

underlying colour model which is

responsible or colour consistencyrom program-to-program and

device-to-device.

This is done using metadata called

ICC profles.

R

G

B

L

*

a

*

b

L*

a

*

b

L

*

a

*

b

L

*

a

*

b

L

*

a

*

b

R

G

B

R

G

B

C

M

Y

K

C

M

Y

K

C

M

Y

K

L

*

a

*

bScann

er

RGBSetup

PressProfile

RGBSetup

PressProfile

ProoferProfile


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The Colour Wheel

Red-Orange

Orange

Yellow-Orange

Yellow

Red

Red-Violet

Violet

Blue-Violet

Blue

Blue-Green

Green

Yellow-Green

The

Twelve-Hue

Colour

Wheel

Thetwelve-hue colour wheelis

a subtractive colour modelthatrepresents many colour rela-

tionshipssimilar to a musical

harmonic scale.


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Primary & Secondary Colours

We start with the threeprimary colours(yellow, blue and red)

equal amounts o primary pigments are then mixed to give

the threesecondary colours(green, violet and orange).

Yellow

RedBlue

ThePrimary

Colours

Orange

Violet

Green

The

Secondary

Colours


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Primary & Secondary Colours

d

Yellow

ReBlue

The

Primary &

Secondary

Colours

Orange

Violet

Green

Arranging thethree primary coloursandthree secondary

coloursin a circle results in this harmonic pattern.


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Tertiary Colours

Red-Orange

Yellow-Orange

Red-Violet

Blue-Green

Yellow-Green

TheTertiary

Colours

Blue-Violet

Combiningequal amounts o primary and secondary colour

pigments results in thesesix tertiary colours.


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The 12-Hue Colour Wheel

Red-Orange

Orange

Yellow-Orange

Yellow

Red

Red-Violet

Violet

Blue-Violet

Blue

Blue-Green

Green

Yellow-Green

The

Twelve-Hue

Colour

Wheel

Arranging the

three primary

colours, three

secondary colours

and thesix tertiary

coloursin a circle

results in the12-

Hue Colour Wheel.


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Warm Colours

Red-Orange

Orange

Yellow-Orange

Yellow

Red

Red-Violet

The

Warm

Colours


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12

Cool Colours

Violet

Blue

Blue-Green

Green

Yellow-Green

The

Cool

Colours

Blue-Violet


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Tetrads & Complimentary Colours

blue-green

green

yellow-green

blue

blue-violet

red-orange

orange

yellow-orange

red

red-violet

violet

yellow Any two colours

directly opposite

each other (like blue

and orange) are

known as

complimentary

coloursthey tend

to strengthen each

others intensity.


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Triads & Analogous Colours

Any three colours

adjacent to each

other (like blue,

blue-violet and

violet) are known

asanalogous

coloursthey

tend to blend into

one another.

blue-green

green

yellow-green

blue

blue-violet

red-orange

orange

yellow-orange

red

red-violet

violet

yellow


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Colour ConceptsSummaryR

G

B

L

*

a

*

b

L

*

a*

b

L

*

a

*

b

R

G

B

R

GB

C

M

Y

K

L

*

a*

bWe have investigated

the ollowing fve

colour systems:

12-HUE

HSB

CMYK

RGB

CIE L*A*B*and ound that each

system is unique, but

all are related.

Documents

Introduction to Colour Concepts