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9colourtheory.ppt

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Uma Mahesh

This document discusses various color theories including subtractive and additive color theories. It explains that subtractive color theory involves absorbing and reflecting light from colored surfaces and is used in printing and painting. Additive color theory involves radiating and filtering light and is used in video, computer monitors, and other light-based mediums. The document also covers Munsell's color wheel model of hue, value, and chromation; various color schemes like monochromatic, complementary, analogous, warm, and cool; color pickers such as RGB, CMYK, HSB; and applications of color theory in art, design, and visual information display.

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Colour Theories & Some Applications
Video Clip from The Devil Wears Prada Ad for Pantone color swatch set with samples of fashion color trends for the autumn 2008 season www.pantone.com
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 Theory The Additive, or light theory deals with radiated and filtered light.
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.
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.
The Visible Spectrum
The Colour Wheel If the ends of the spectrum are bent around a colour wheel is formed:
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)
Goethes Theory of Colours (1810) Built on wavelength theory of light Methods interesting Conclusion refuted Influential on artists Ex. Turner Colour theory weblink Goethes Colour Wheel
The Colour Tree by American artist Henry Albert Munsell from A Colour Notation, 1905.
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
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.
The Colour Wheel: Value "the quality by which we distinguish a light colour from a dark one." - Albert Henry Munsell A Colour Notation 1905 Value represents the luminescent contrast value between black and white
The Colour Wheel: Value
The Colour Wheel: Value
The Colour Wheel 3d Three parameters to describe a colour: Hue Chroma Value
Tone = Shade + Tint
Colour Pickers HSB, HLS, HSV RGB CMYK Others Lab PANTONE Munsells notation wheel
optical effects of adjacent tonal values or colours link to stroboscopic effects of complementary colors http://www.michaelbach.de/ot/m ot_strob/index.html
Colour Schemes Systematic ways of selecting colours Monochromatic Complimentary Analogous Warm Cool Achromatic Chromatic Grays
Colour Schemes: Monochromatic Monochromatic: One Hue many values of Tint and Shade Artist: Marc Chagall Title: Les Amants Sur Le Toit
Colour Schemes: Complementary (note spelling--NOT complimentary) Complimentary: Colours that are opposite on the wheel. High Contrast Artist: Paul Cezanne Title: La Montage Saint Victoire Year: 1886-88
19th c. theories of Simultaneous Contrast and optical mixing Example: tapestry production (French chemist: Michel Eug竪ne Chevreul, Law of simultaneous contrast of colours, 1839) Ex. Pointillism (neo- expressionism)--Seurat Complementary Colours & Optical Mixing in art & design
20th c. : In Art Johannes Itten, Josef Albers, Op Art
Scientific & Industry-specific Color systems Various color systems CIE (Commission internationale d辿clairage), Munsell (Albert Munsell) and MANY others
Color for Categories and Sequences
Using Color-- blue in large regions, not thin lines red and green in the center of the field of view (edges of retina not sensitive to these) black, white, yellow in periphery Color Brewer Pantone
Colour Schemes: Analogous Analogous: A selection of colours that are adjacent. Minimal contrast Artist: Vincent van Gogh Title: The Iris Year: 1889
Colour Schemes: Warm Warm: First half of the wheel give warmer colours. The colours of fire. Artist: Jan Vermee Title: Girl Asleep at a Table Year: 1657
Colour Schemes: Cool Cool: Second half of the wheel gives cooler colours Artist: Pablo Picasso Title: Femme Allong辿e Lisant Year: 1939
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.
Colour Pickers: HSB, HLS, HSV HSV Hue Saturation Value HSB (Same as HSV) Hue Saturation Brightness HLS Hue Lightness Saturation
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
Photoshop CS3 Picker Combines HSB, RGB, CMYK, Lab (Luminance, Red/Green, Yellow/Blue) Adobe http://kuler.adobe.com/
Colour Pickers: PANTONE Standard for printing/fastion industry
Color and the visual display of information Ware, p. 84
Colour (hue) and counting辿searching
Hue: where is the red circle? Not Usually Pre-attentive
Hue & shape
Region Search Hue boundary identified pre-attentively Form variations do NOT interfere with hue boundary identification Form boundary NOT identified pre-attentively Hue variations interfere with form boundary identification
Area Estimation Blue rectangles? Sloped rectangles?
Fill and Shape
Brightnesss
Shape again
Luminance/Contrast
9colourtheory.ppt

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9colourtheory.ppt

  • 2. Video Clip from The Devil Wears Prada Ad for Pantone color swatch set with samples of fashion color trends for the autumn 2008 season www.pantone.com
  • 3. 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 Theory The Additive, or light theory deals with radiated and filtered light.
  • 4. 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.
  • 5. 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.
  • 7. The Colour Wheel If the ends of the spectrum are bent around a colour wheel is formed:
  • 8. 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)
  • 9. Goethes Theory of Colours (1810) Built on wavelength theory of light Methods interesting Conclusion refuted Influential on artists Ex. Turner Colour theory weblink Goethes Colour Wheel
  • 10. The Colour Tree by American artist Henry Albert Munsell from A Colour Notation, 1905.
  • 11. 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
  • 12. 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.
  • 13. The Colour Wheel: Value "the quality by which we distinguish a light colour from a dark one." - Albert Henry Munsell A Colour Notation 1905 Value represents the luminescent contrast value between black and white
  • 16. The Colour Wheel 3d Three parameters to describe a colour: Hue Chroma Value
  • 17. Tone = Shade + Tint
  • 18. Colour Pickers HSB, HLS, HSV RGB CMYK Others Lab PANTONE Munsells notation wheel
  • 19. optical effects of adjacent tonal values or colours link to stroboscopic effects of complementary colors http://www.michaelbach.de/ot/m ot_strob/index.html
  • 20. Colour Schemes Systematic ways of selecting colours Monochromatic Complimentary Analogous Warm Cool Achromatic Chromatic Grays
  • 21. Colour Schemes: Monochromatic Monochromatic: One Hue many values of Tint and Shade Artist: Marc Chagall Title: Les Amants Sur Le Toit
  • 22. Colour Schemes: Complementary (note spelling--NOT complimentary) Complimentary: Colours that are opposite on the wheel. High Contrast Artist: Paul Cezanne Title: La Montage Saint Victoire Year: 1886-88
  • 23. 19th c. theories of Simultaneous Contrast and optical mixing Example: tapestry production (French chemist: Michel Eug竪ne Chevreul, Law of simultaneous contrast of colours, 1839) Ex. Pointillism (neo- expressionism)--Seurat Complementary Colours & Optical Mixing in art & design
  • 24. 20th c. : In Art Johannes Itten, Josef Albers, Op Art
  • 25. Scientific & Industry-specific Color systems Various color systems CIE (Commission internationale d辿clairage), Munsell (Albert Munsell) and MANY others
  • 26. Color for Categories and Sequences
  • 27. Using Color-- blue in large regions, not thin lines red and green in the center of the field of view (edges of retina not sensitive to these) black, white, yellow in periphery Color Brewer Pantone
  • 28. Colour Schemes: Analogous Analogous: A selection of colours that are adjacent. Minimal contrast Artist: Vincent van Gogh Title: The Iris Year: 1889
  • 29. Colour Schemes: Warm Warm: First half of the wheel give warmer colours. The colours of fire. Artist: Jan Vermee Title: Girl Asleep at a Table Year: 1657
  • 30. Colour Schemes: Cool Cool: Second half of the wheel gives cooler colours Artist: Pablo Picasso Title: Femme Allong辿e Lisant Year: 1939
  • 31. 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.
  • 32. Colour Pickers: HSB, HLS, HSV HSV Hue Saturation Value HSB (Same as HSV) Hue Saturation Brightness HLS Hue Lightness Saturation
  • 33. 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
  • 34. Photoshop CS3 Picker Combines HSB, RGB, CMYK, Lab (Luminance, Red/Green, Yellow/Blue) Adobe http://kuler.adobe.com/
  • 35. Colour Pickers: PANTONE Standard for printing/fastion industry
  • 36. Color and the visual display of information Ware, p. 84
  • 38. Hue: where is the red circle? Not Usually Pre-attentive
  • 40. Region Search Hue boundary identified pre-attentively Form variations do NOT interfere with hue boundary identification Form boundary NOT identified pre-attentively Hue variations interfere with form boundary identification
  • 41. Area Estimation Blue rectangles? Sloped rectangles?