1. College of Civil Engeneering, B407
Computer Graphics
Tomas Vanicek
College of Civil Engeneering, B407 1

2. Methods of graphical information saving
Grid
Vector 2

3. Grid formats 3

4. Colours in Computer Graphic4

5. Electromagnetic Waves5

6. Visible light Frequency 3.8×1014 Hz až 7.5×1014 Hz
Wavelength 800nm – 400nm = 8-4×10-7m 6

7. Colour perception – Spectral function7

8. Colour Models
The spectral functions forms vector space of infinity dimension
Human eye can recognize only – 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) 8

9. RGB model 9

10. Aditive composition of colours10

11. RGB – 8 basic colours 11

12. RGB – 256 colours
8 x 8 x 4 partion 12

13. RGB True Color
256 x 256 x 256 = colours 13