Dobivanje spotne boje pomoću procesnih boja

Savović, Mario (2013) Dobivanje spotne boje pomoću procesnih boja. Master's thesis - Graduate Programme. Grafički fakutet. [Mentor: Mandić, Lidija].

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Abstract

Tisak u boji se danas radi najčešće pomoću četiri glavne procesne boje. Spotne boje se dobivaju miješanjem po zadanoj recepturi, te se njima znatno povećava gamut reprodukcije. No takav tisak je dosta skup i ponekad nepotreban, pa se spotne boje konvertiraju u procesne i tako tiskaju. U ovom radu je pokazano koji su rezultati tiska spotnih boja pomoću procesnih. Otisnuti su uzorci na oba načina, te su napravljene usporedbe pomoću spektrofotometrijskih mjerenja. Određena je razlika među bojama, ΔE, te su prikazani grafikoni CIE Lab vrijednosti za svaki par boja. Na taj način se vidi kod kojih boja je veća razlika, a kod kojih manja. Rezultati su dali velike vrijednosti ΔE razlike boja, za većinu uzoraka. Kod nekih uzoraka ta vrijednost je manja, i iznosi ΔE = 3,3, odnosno ΔE = 4,2. Ta je razlika vidljiva ljudskim okom, ali za tisak spotne boje pomoću procesnih nije toliko velika. Ostale razlike među bojama su veće od ΔE = 10. Zaključak je da se spotne boje ne mogu otiskivati procesnim bojama, ako su izvan gamuta reprodukcije. Hexachrome tehnika ofsetnog tiska koristi dodatnu narančastu i zelenu boju, pa je i gamut reprodukcije veći. Na taj način se može obuhvatiti i otisnuti znatno veći broj spotnih boja.

Item Type:	Master's thesis - Graduate Programme
Mentor name:	Mandić, Lidija
Defence date:	24 September 2013
Abstract in english:	Colour print today is usually done by using four process colours. Spot colours are made by mixing basic colours using formula guide. Spot colours give much wider reproduction gamut, but using them in print is expensive and sometimes needless, so spot colours are converted to process colours and printed that way. In this paper it is shown how spot colours look when printed with process colours. Test pieces are printed both ways, and then compared using spectrophotometric measurements. For every colour the difference ΔE is calculated. Also, colours are shown using CIE Lab values for every pair. In that way we can see where are bigger differences and where smaller. For most test pieces colour differnce ΔE is quite big. For some pairs it is smaller, ΔE = 3,3, and ΔE = 4,2. That difference can be seen with human eye, but it is not so big for printing spot colours with process colours. The difference between other pairs is above ΔE = 10. To conclude, spot colour cannot be printed using process colours, if they are out of reproduction gamut. In Hexachrome offset print, where orange and green colour is added, the gamut is much wider, and more spot colours can be printed.
Uncontrolled Keywords:	spotne boje, konverzija boja, gamut reprodukcije
Keywords in english:	spot colour, process colours, reproduction gamut
Subjects:	TECHNICAL SCIENCES > Graphic Technology
Institution:	Grafički fakutet
City:	Zagreb
Number of Pages:	51
Callnumber:	man 2013 sav
Inventory number:	DB278
Depositing User:	Dora Budić
Status:	Unpublished
Date Deposited:	16 Apr 2014 07:55
Last Modified:	16 Apr 2014 07:55
URI:	http://eprints.grf.unizg.hr/id/eprint/1551

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