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Knitted shirts are an appropriate carrier for easily readable information, and therefore, in recent years, QR Codes are very often printed on T-shirts. With the purpose of investigating QR Code fastness printed on textiles, in the paper a methodology was proposed for durability assessment of functionally printed knitted fabrics that includes the implementation of long-term care and wearing simulation - which the T-shirts are exposed to over the lifetime. Dimensional changes after multiple washing and drying cycles were determined for non-printed and functionally printed white knitting ; abrasion resistance and tendency to surface pilling after multiple rubbing cycles. The effect of usage simulation on functional prints durability was defined, as well as color fastness, readability and aesthetic properties. It was found that structure of knitted fabrics, their dimensional stability, the number of care and wear cycles performed, the printing technique and size of black modules in QR Code all have an influence on the results obtained.

Raznovrsne tehnologije tiskarskih procesa uzrokuju različita odstupanja u kvaliteti otisnutog grafičkog proizvoda. Etikete kao grafički proizvodi osjetljive su na takve promjene, budući najčešće predstavljaju prvi kontakt između kupca i proizvoda na koji je etiketa aplicirana. Ovo istraživanje usmjereno je na otiske kojima dominiraju tamnije boje, otisnute tehnikom ofsetnog tiska. Cilj ovih istraživanja je na osnovu spektrofotometrijskih mjerenja i vizualne ocjene kvalitete tiska, konstruirati MacAdamsove elipsoide i ustanoviti je li moguće MacAdamsovim elipsodima ustanoviti kvalitetu tiska u području tamnih boja. Nakon provedenih istraživanja, ustanovljeno je da elipsoidi pokrivaju različita područja unutar CIE L*a*b* sustava. Osim navedenog ustanovljeno je da je vizualnom procjenom moguće percipirati male promjene u tamnim bojama, ali ne u svim vrijednostima linearno. Korelacijom navedenih rezultata, zaključeno je da je prilikom ustanovljavanja kvalitete tiska tamnih boja moguće koristiti MacAdamsove elipsoide., Various technologies of printing processes induce various deviations in the quality of the printed graphic product. Labels as graphic products are sensitive to such changes, since they represent the first contact between the consumer and the product the label is applied on. This research is oriented towards imprints dominated by dark colours, printed using the offset printing technique. Goal of this research is to, based on the spectrophotometric measuring and visual evaluation of the printing quality, construct the MacAdams ellipsoids and establish whether it is possible to establish the printing quality in the area of dark colours using MacAdams ellipsoids. After conducted research it was established that the ellipsoids cover various areas within CIE L*a*b* system. By correlating the stated results, it was concluded that while establishing the printing quality of the dark colour it is possible to use MacAdams ellipsoids.