PROBLEMATIKA USKLAĐIVANJA AKROMATSKIH TONOVA

PROBLEMS OF ACHROMATIC COLOUR HUES MATCHING

Đurđica Parac-Osterman, Martinia Ira Glogar

Sažetak

U industrijskoj praksi, tehnolozi, dizajneri i grafi čari, svakodnevno se susreću sa zadacima precizne reprodukcije boje i usklađivanja tonova. Cilj je postići obojenje s defi - niranim parametrima boje i remisijskim svojstvima što bližima zadanom standardu. Tehnološki napredak u nekoliko posljednjih dekada uvjetovao je porast zahtjeva na kvalitetu reprodukcije i usklađenosti boje, dok se od same proizvodnje zahtjeva kraći i jeftiniji proizvodni proces. U takvim uvjetima, reprodukcija boje općenito, a posebno akromatskih tonova postaje vrlo kompleksan proces, obzirom na postavljene zahtjeve i brojne čimbenike koji utječu na reprodukciju u akromatskom području. U ovom radu analizirani su crni i tamno sivi akromatski tonovi s prosječnom vrijednošću svjetline L*≤ 20. Provedeno je subjektivno i objektivno vrednovanje boje, te je prikazana usporedba rezultata razlika u boji dobivenih objektivnim vrednovanjem putem dvaju formula: CIELAB i CMC(l:c).

KLJUČNE RIJEČI: AKROMATSKI TONOVI, VIZUALNA PERCEPCIJA, OBJEKTIVNO VREDNOVANJE, PROSTOR BOJE, CIELAB, CMC(L:C)

Abstract

Technologists, designers and graphic professionals are daily faced with tasks of precise colour reproduction and hues matching. Th e aim is to achieve the colour with defi ned colour parameters and remission properties as close to given standard. Technological development in a past few decades caused increase in quality rquests of colour reproduction and matching. However, in a terms of high requests on colour parameter matching, right on time production, quick response and high quality standards requests, the production and moreover the reproduction of achromatic hues is subject to many variables and represent the manufacturing process of high complexity. In this paper, black and grey hues characterized with average lightness value L*≤ 20, were analysed. Subjective as well as objective colour evaluation have been performed and results of colour diff erences obtained by two colour diff erence formulae, CIELAB and CMC(l:c) have been compared.

KEYWORDS: ACHROMATIC HUES, VISUAL PERCEPTION, OBJECTIVE EVALUATION, COLOUR SPACE, CIELAB, CMC(L:C)
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