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Computer Graphics

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... Subtractive composition of colours CMYK model Colour K made from CMY is not precise It is cheaper Model HLS (Hue, Light, Saturation) ... – PowerPoint PPT presentation

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Title: Computer Graphics


1
Computer Graphics
  • Tomas Vanicek
  • College of Civil Engeneering, B407
  • vanicek_at_fsv.cvut.cz
  • http//kix.fsv.cvut.cz/vanicek

2
Methods of graphical information saving
  • Grid
  • Vector

3
Grid formats




















4
Colours in Computer Graphic
5
Electromagnetic Waves
6
Visible light
  • Frequency 3.81014 Hz až 7.51014 Hz
  • Wavelength 800nm 400nm 8-410-7m

7
Colour perception Spectral function
8
Colour Models
  • The spectral functions forms vector space of
    infinity dimension
  • Human eye can recognize only 10.000 50.000
    colour hues
  • In fact only 3 dimensional vector space is
    usually sufficient
  • We must chose 3 vector of base, 3 basic colour,
    for example Red (R), Green (G) and Blue (B)

9
RGB model
10
Aditive composition of colours
11
RGB 8 basic colours
12
RGB 256 colours
  • 8 x 8 x 4 partion

13
RGB True Color
  • 256 x 256 x 256 16.777.216 colours


14
CMY model
  • Subtractive composition of colours

15
CMYK model
  • Colour K made from CMY is not precise
  • It is cheaper

16
Model HLS (Hue, Light, Saturation)
S
Light
17
Model HLS
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