1. Colorimetry - Introduction

2. Light and colour and its use
Light source colour
Colour of materials
Alpha-numeric information
accentuation
ordering
Graphical information
Characteristic colours
Images
Colour correct visualization

3. What is colour?

4. What is colour?
colour stimulus, visible electromagnetic radiation reaching our eye from the environment
percept, produced by the stimulus in the receptors
perception, produced in the brain

5. What is colour? The rays are not coloured
Colour is a perception produced in the brain

6. What is colour?
The stimulus originating in from the source is modified by reflecting/transmitting bodies
The perceives, the brain processes the stimulus

7. Characteristics of the colour perception
hue brightness/lightness satuartion

8. Production of the colour stimulus
source
body, modifying the radiation
receiver

9. Sources
Daylight
Artificial lights

10. Mixture of coloured lights
Additive colour mixing
Perception in the visual system

11. Colour mixture in the CRT
Emission of red, green and blue phosphors produce the colour stimulus

12. Brightness contrast

13. Colour contrast

14. The influence of the background

15. Further visual impressions

16. ASSIMILATION

17. SPREADING
The background has the same chromaticity, only the colour of the lines is different

18. Effect of the sharpness of the contour
In the middle of all patches the colour stimulus is the same

19. Perception of colour difference
Effect of background on colour difference perception

20. Perception of deepness
The red surface is perceived as being closer to us
Position of the surface can increase the effect

21. Coloured after-image

22. Coloured after-image

23. Sharpness – a psychological effect
Webster MA. Adaptation & visual experience. Opt.&Photonics News Jan

24. The influence of the surrounding on sharpness sensation
Webster MA. Adaptation & visual experience. Opt.&Photonics News Jan

25. Facial features
Webster MA. Adaptation & visual experience. Opt.&Photonics News Jan

26. Facial features
Webster MA. Adaptation & visual experience. Opt.&Photonics News Jan

27. Mechanism of human colour vision
Structure of the human retina and its functioning
cones and rods
information processing in the retina
Pathways to the brain, brain processing
Colour vision deficiencies

28. Objective determination of the colour stimulus
Additive colour mixing
Basics, Grassmann’s laws
RGB and CIE XYZ colour spaces
Transformation of colour spaces
Standardized colour metrics
2°- and 10°-observers

29. Colour specification on the computer monitor
Colorimetry of self-luminous objects
CRT monitor characterization
Concept of correlated colour temperature

30. Object (surface) colours, uniform colour spaces and atlanta
CIELUV and CIELAB colour spaces
Munsell, NCS, Coloroid colour spaces and atlases
Concept of colour stimulus difference
Colour difference metrics

31. Chromatic adaptation and colour appearance
von Kries transformation
modern approaches
Colour appearance, images on computer screens
Colour appearance models
CIECAM97 model

32. Colour printing Functioning of colour printers
Calibration of colour printers
Colour management

33. Further technologies Colour TV
Colour film (positive - negative processes)
Colours on the Internet

34. Standards IEC TC 100 multimedia equipment
ISO ergonomic & graphic art standards
CIE vision – photometry – colorimetry standards
TV and further standards

35. The use of colours on computers
Small angle tritanopy
Bezold-Brücke effect
Helmholtz-Kohlrausch effect
Colour induction and assimilation