Striking changes in colour appearance can arise when small areas of colour are seen in juxtaposition against a coloured background. These changes are of great interest as a problem in visual physiology since many factors may contribute to the effect. They are also of practical importance since they may have a major influence on colour design. Different techniques of subjective colour measurement are surveyed. Two methods are used to measure these colour changes as' a basis for the quantitative study of the colour contrast phenomena. In the first method: Standard source SA is used for illumination of the test colour in its surround, and its ap)earance is compared with a red-green,blue mixture from a modified form of Donaldson Colorimeter using monocular vision. In the second method: Natural daylight is used as illuminant and the colour appearance is matched by a number of observers having normal colour vision by comparison with colour samples in the Mansell Book of Color. The effects of different simple and compound, one colour and two colour surrounds, are analised. Also the effects of the following different viewing conditions are studied: (1) The luminance of the surround of the comparison patch. (2) The luminance of the surround of the test colour. (3) The luminance of the whole test patch, (4)Th e angle of subtense of the test patch. (5) The inclination of the test patch. (6)Th e orientation of the coloured stripes of the surround. (7) The movement of the test patch (The dynamic colour contrast) Some possible causes of such colon, contrast phenomena in the field of physics, physiology and psychology are discussed.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:602202 |
| Date | January 1963 |
| Creators | Gindy, Sobhy Samaan |
| Publisher | Imperial College London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/10044/1/13264 |
Page generated in 0.0014 seconds