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Gamma and Colour Space      Digital Technical
What is Gamma?• Gamma correction, gamma nonlinearity,  gamma encoding, or often simply gamma, is  the name of a nonlinear ...
Bending the Curve; making image             darker
Bending the Curve; making image             lighter
Lifting the curve changing black and              white data
Lifting the curve changing black and              white data
DE-Facto Computer Monitor
Gamma Encoded in Files
H.264 Gamma Shift
What is a Colour Model• A colour model is an abstract mathematical  model describing the way colors can be  represented as...
Colour Models
What is a Colour Space• Color space is a more specific term for a  certain combination of a color model plus a  mapping fu...
Colour Space• Gamut + Colour Model = Colour Space• ( a colour mapping function + colour model =  colour space)
HSL
What is a Gamut• Adding a certain mapping function between  the color model and a certain reference color  space results i...
Gamut• In color theory, the gamut of a device or  process is that portion of the color space that  can be represented, or ...
CRT Gamut
Capturing the Colour Space
Capturing the Colour Space• Camera Level• The white triangle is what the camera is  producing.• Postproduction• We want th...
Gamma and Colour Space
Gamma and Colour Space
Gamma and Colour Space
Gamma and Colour Space
Gamma and Colour Space
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Gamma and Colour Space

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Gamma and Colour Space

  1. 1. Gamma and Colour Space Digital Technical
  2. 2. What is Gamma?• Gamma correction, gamma nonlinearity, gamma encoding, or often simply gamma, is the name of a nonlinear operation used to code and decode luminance in video or still image systems.
  3. 3. Bending the Curve; making image darker
  4. 4. Bending the Curve; making image lighter
  5. 5. Lifting the curve changing black and white data
  6. 6. Lifting the curve changing black and white data
  7. 7. DE-Facto Computer Monitor
  8. 8. Gamma Encoded in Files
  9. 9. H.264 Gamma Shift
  10. 10. What is a Colour Model• A colour model is an abstract mathematical model describing the way colors can be represented as tuples of numbers, typically as three or four values or color components (e.g. RGB and CMYK are color models).•
  11. 11. Colour Models
  12. 12. What is a Colour Space• Color space is a more specific term for a certain combination of a color model plus a mapping function, the term "color space" tends to be used to also identify color models, since identifying a color space automatically identifies the associated color model.
  13. 13. Colour Space• Gamut + Colour Model = Colour Space• ( a colour mapping function + colour model = colour space)
  14. 14. HSL
  15. 15. What is a Gamut• Adding a certain mapping function between the color model and a certain reference color space results in a definite "footprint" within the reference color space.• This "footprint" is known as a gamut, and, in combination with the color model, defines a new color space.
  16. 16. Gamut• In color theory, the gamut of a device or process is that portion of the color space that can be represented, or reproduced. Generally, the color gamut is specified in the hue– saturation plane, as a system can usually produce colors over a wide intensity range within its color gamut.
  17. 17. CRT Gamut
  18. 18. Capturing the Colour Space
  19. 19. Capturing the Colour Space• Camera Level• The white triangle is what the camera is producing.• Postproduction• We want the black triangle

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