Odstupanja Lab vrijednosti osnovnih Pantone bojila u realnim mjerenjima

Tajana Koren, Dubravko Deželić, Nikolina Stanić

Svaki proizvođač bojila ima propisane Lab vrijednosti bojila kao i recepturu miješanja tih bojila. Pantoneova paleta osnovnih bojila se sastoji od 14 boja te transparentne bijele. U ovom radu se govori o odstupanjima pre-definiranih vrijednosti za svaku pojedinu boju u odnosu na realne boje otisnute ofsetnom tehnikom tiska. Razlika u boji, odnosno odstupanja u Lab vrijednostima osnovnih Pantone bojila mjerena su na otiscima za koje su korištena bojila licenciranih Pantone proizvođača bojila, u odnosu na zadane vrijednosti Pantone bojila. Uspoređuju se otisci dva licencirana proizvođača Pantone boja, na dvije vrste papira sa numeričkim Lab vrijednostima istih tih boja kolorimetrijskog uređaja X-rite Spectroeye te kataloga Pantone boja. Odstupanja mogu nastati iz niza faktora. Ti su faktori u ovom istraživanju reducirani na najmanju mjeru korištenjem istog uređaja, istog ljudskog faktora, iste tiskovne forme, uvjeta tiska i papira.

Basic Pantone ink Lab value deviations in real life measurements

Tajana Koren, Dubravko Deželić, Nikolina Stanić

Every ink producer has regulated set Lab values for inks as well as the prescription for mixing those inks. The Pantone basic colorant palette consists of 14 colors and the transparent white. This paper is on the deviations of preset values for each individual color in respect to real life colors printed by offset printing technique. The difference in color, i.e. the deviations in Lab values compared to set Pantone ink values of basic Pantone inks have been measured on sample prints using colorants produced by licensed Pantone ink producers. Prints made by Pantone inks produced by two licensed Pantone ink producers are compared, using two kinds of paper with numerical Lab values of the same colors of the colorimetric device X-rite Spectroeye and Pantone ink catalog. Deviations may occur due to several factors. Such factors have been reduced in this research work to the minimum by using the same equipment, the same human factor, the same printing forms, printing conditions and paper.

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