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Computer Graphics Tomas Vanicek College of Civil Engeneering, B407 [email protected] http://kix.fsv.cvut.cz/vanicek Methods of graphical information saving • Grid • Vector Grid formats Colours in Computer Graphic Electromagnetic Waves Visible light • Frequency 3.8×1014 Hz až 7.5×1014 Hz • Wavelength 800nm – 400nm = 8-4×10-7m Colour perception – Spectral function 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) RGB model Aditive composition of colours RGB – 8 basic colours RGB – 256 colours • 8 x 8 x 4 partion RGB True Color • 256 x 256 x 256 = 16.777.216 colours CMY model • Subtractive composition of colours CMYK model • Colour K made from CMY is not precise • It is cheaper Model HLS (Hue, Light, Saturation) S Light Model HLS
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