colour theories & some applications. video clip from the devil wears prada ad for pantone color...
TRANSCRIPT
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Colour Theories & Some
Applications
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Video Clip from The Devil Wears Prada
Ad for Pantone color swatch set with samples of fashion color trends for the autumn 2008 seasonwww.pantone.com
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Colour Theories
1. Subtractive Theory• The subtractive, or
pigment theory deals with how white light is absorbed and reflected off of coloured surfaces.
2. Additive Theory1. The Additive, or light
theory deals with radiated and filtered light.
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Subtractive Theory• Black absorbs most light• White reflects most light• Coloured Pigments absorb light and
reflect only the frequency of the pigment colour.
• All colours other than the pigment colours are absorbed so this is called subtractive colour theory.
• The primary colours in Subtractive Theory are:– Cyan ( C )– Magenta( M )– Yellow ( Y )– Black ( K )
• Subtractive or Pigment Theory is used in printing and painting.
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Additive Theory• Black radiates no light• White (sun) radiates all light• Video is the process of capturing and
radiating light, therefore it uses Additive (Light) Theory not Subtractive (Pigment) Theory.
• The primary colours in Additive Theory are:– Red ( R )– Green ( G )– Blue ( B )
• The primary colours add together to make white
• Light Theory is also called Additive Theory.
• Light Theory is used in Television, theater lighting, computer monitors, and video production.
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The Visible Spectrum
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The Colour Wheel
If the ends of the spectrum are bent around a colour wheel is formed:
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The Colour Wheel
• Colours on the wheel can be described using three parameters:
1. Hue: degrees from 0˚ to 360˚
2. Saturation: brightness or dullness
3. Value: lightness or darkness
(As suggested by Henry Albert Munsell in A Colour Notation, 1905)
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Goethe’s Theory of Colours (1810)
• Built on wavelength theory of light
• Methods interesting• Conclusion refuted• Influential on artists• Ex. Turner• Colour theory
weblink
Goethe’s Colour Wheel
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The Colour Tree by American artist Henry Albert Munsell fromA Colour Notation, 1905.
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The Colour Wheel: Hue
• Hue or Spectral Colour is represented as an angle.
• Primary Colours:• 0˚ = Red• 120˚ = Green• 240˚ = Blue
• Secondary Colours:• 60˚ = Yellow• 180˚ = Cyan• 300˚ =
Magenta
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The Colour Wheel: Saturation• Saturation or Chroma is
the intensity of a colour.• A highly saturated colour
is bright and appears closer to the edge of the wheel.
• A more unsaturated colour is dull.
• A colour with no saturation is achromatic or in the grey scale.
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The Colour Wheel: Value"the quality by which we distinguish a light colour from a dark one."
- Albert Henry MunsellA Colour Notation 1905
Value represents the
luminescent contrast value between black and white
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The Colour Wheel: Value
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The Colour Wheel: Value
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The Colour Wheel 3dThree parameters to describe a colour:
Hue Chroma Value
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Tone = Shade + Tint
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Colour Pickers
• HSB, HLS, HSV• RGB• CMYK• Others
– Lab– PANTONE
Munsell’s notation wheel
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optical effects of adjacent tonal valuesor colours
link to stroboscopic effects of complementary colorshttp://www.michaelbach.de/ot/mot_strob/index.html
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Colour SchemesSystematic ways of selecting colours
• Monochromatic• Complimentary• Analogous• Warm • Cool• Achromatic• Chromatic Grays
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Colour Schemes: Monochromatic
• Monochromatic: One Hue many values of Tint and Shade
Artist: Marc ChagallTitle: Les Amants Sur Le Toit
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Colour Schemes: Complementary (note spelling--NOT complimentary)
• Complimentary: Colours that are opposite on the wheel. High Contrast
Artist: Paul Cezanne Title: La Montage Saint VictoireYear: 1886-88
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• 19th c. theories of “Simultaneous Contrast” and optical mixing – Example: tapestry
production (French chemist: Michel Eugène Chevreul, Law of simultaneous contrast of colours, 1839)
– Ex. Pointillism (neo-expressionism)--Seurat
Complementary Colours & “Optical Mixing in art & design
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20th c. : In Art Johannes Itten, Josef
Albers, Op Art
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Scientific & Industry-specific Color systems
• Various color systems
• CIE (Commission internationale d’éclairage),
• Munsell (Albert Munsell)
• and MANY others
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Color for Categories and Sequences
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Using Color--
• blue in large regions, not thin lines• red and green in the center of the
field of view (edges of retina not sensitiveto these)
• black, white, yellow in periphery• Color Brewer• Pantone
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Colour Schemes: Analogous
• Analogous: A selection of colours that are adjacent. Minimal contrast
Artist: Vincent van GoghTitle: The IrisYear: 1889
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Colour Schemes: Warm
Warm: First half of the wheel give warmer colours. The colours of fire.
Artist: Jan VermeeTitle: Girl Asleep at a Table Year: 1657
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Colour Schemes: Cool
Cool: Second half of the wheel gives cooler colours
Artist: Pablo PicassoTitle: Femme Allongée Lisant Year: 1939
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Colour Schemes:Achromatic, Chromatic Grays
Achromatic: Black and white with all the grays in-between.
Chromatic Grays: Also called neutral relief. Dull colours, low contrast.
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Colour Pickers: HSB, HLS, HSV
• HSV• Hue• Saturation• Value
• HSB (Same as HSV)• Hue• Saturation• Brightness
• HLS• Hue• Lightness• Saturation
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Colour Pickers: RGB, CMYK
• RGB • Red• Green• Blue
– Used in Video and Computer graphics
– 3 Values in % or between • 0-255
• CMYK• Cyan• Magenta• Yellow• K = Black
– Used for printing
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Photoshop CS3 Picker
• Combines HSB,RGB, CMYK,Lab (Luminance, Red/Green, Yellow/Blue)
• Adobe http://kuler.adobe.com/
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Colour Pickers: PANTONE
• Standard for printing/fastion industry
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Color and the visual display of information
Ware, p. 84
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Colour (hue) and countingésearching
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Hue: where is the red circle? Not Usually Pre-attentive
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Hue & shape
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Region Search
Hue boundary identifiedpre-attentively
Form variations do NOTinterfere with hueboundary identification
Form boundary NOTidentified pre-attentively
Hue variations interferewith form boundaryidentification
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Area Estimation• Blue rectangles? Sloped rectangles?
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Fill and Shape
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Brightnesss
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Shape again
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Luminance/Contrast
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