engleski

Ral system reliability

In all technological branches that employs colour management and colour communication system, RAL colour system is used as mean of simple and quick choice and comparisement of desired colour. However, practice proved RAL system as unsuitable in a processes of reproduction in comparison with visual evaluation as well as instrumental CIELab evaluation. In this paper, reliability and suitability of RAL system was analysed by means of statistical evaluations and compared to computer based CIELab system. Three groups of hue samples were chosen: H* 080 – 090 (yellow), H* 350 – 360 (red), H* 200 – 210 (blue). Analysis were made based on Y tristimulus value that define true lightness value of one coloured surface. L*, C* and H* colour values were calculated as well as dE value and statistical evaluation was performed according to “ t” and “ F” statistical test. Results obtained showed disagreement of RAL system in compare with CIELab system in the area of yellow and blue hues. This confirm lower reliability of RAL system for hues mentioned than for the are of red hues.

RAL ; reliability ; CIE L*a*b* ; statistic

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