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Acta graphica : journal for printing science and graphic communications, Vol.23 No.1-2 July 2012. -

Photometric parameters and the evaluation of colour phenomena based on real

human perception of light and colour were introduced into colour science in the

first half of the 20th century. However, in the last two decades some known software

programs for 3D computer graphics attempt to simulate realistic light source

and optical effects with the help of photometric parameters. The reason for somewhat

late arrival of such software applications can be found in the prevalent use of

RGB colour space and the complexity of achieving realistic light source and colour

effects. The aim of the research was to write and implement a simple gamut compression

algorithm that will make colour transformation from input XYZ data to

appropriate RGB data of sRGB colour space within large number of colours 1872

and different illuminants 16, and also to define appropriate light source intensity

in 3D modelling software to achieve optimal matching of simulated and real photographic

lights with predefined RGB values. Due to discrepancies between real

light sources and the interpretation of light source colours in 3D, RGB colours of

sRGB had to be adjusted with calibration procedure developed. The results of the

research offer the possibility for theoretical prediction of virtual colours and light

source intensity for different colours of light sources.

RGB colour space; simulation of colour and light source; 3D graphic software colour conversion

Autor: Dejana Javoršek - ; Faculty of Natural Sciences and Engineering, University of Ljubljana Ljubljana, Slovenia Andrej Iskra - ; Fa



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