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

Original scientific paper

Theoretical Prediction of Colours and Illuminants in sRGB Colour Space

Dejana Javoršek ; Faculty of Natural Sciences and Engineering, University of Ljubljana Ljubljana, Slovenia
Andrej Iskra ; Faculty of Natural Sciences and Engineering, University of Ljubljana Ljubljana, Slovenia
Helena Gabrijelčič Tomc ; Faculty of Natural Sciences and Engineering, University of Ljubljana Ljubljana, Slovenia
Andrej Javoršek ; Faculty of Natural Sciences and Engineering, University of Ljubljana Ljubljana, Slovenia

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Abstract

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.

Keywords

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

Hrčak ID:

86088

URI

https://hrcak.srce.hr/86088

Publication date:

11.7.2012.

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