This study characterizes and compares the parameters of the quality reproduction of fine elements in flexography on coated and uncoated paper as well as on OPP film (oriented polypropylene). A monochrome test form was created and printed using cyan UV ink. The analysis of results confirms the importance of interaction between the printing substrate and ink; it also indicates identical line and text deformations on the print. Quality reproduction on coated paper is higher in relation to OPP film for all the research parameters. The ink penetrates significantly more and with more irregularity into the pores and throats of the uncoated paper, which results in less homogeneous elements, and in such way that it loses its original shape. In coated paper and OPP film, the ink spreads more on the substrate area which gives it a significantly more homogeneous shape. However, due to the surface spread of the ink, the biggest changes in the size of fine elements are noticeable in the OPP film. The scientific contribution of this paper is based on the comparison of print quality parameters of fine elements, which can contribute to the optimization of the production process and quality of the final graphical product.

Original scientific paper In this paper authors examine readability and legibility of text on iPad and compare it partially to reading from computer screen and paper. Following previous research, two independent variables were measured: speed of reading (T) and subjective difficulty of reading (Z). 220 university students aged 18÷48 participated in the experiment and were divided into 11 groups of 20 participants. Key findings are as follows: Sans serif Gotham font is more readable and legible on iPad than Minion Pro serif font, although, when presented in bigger font sizes there is no significant difference between the two letter cases; two column spread of text was the hardest to read, giving fewer number of characters per row; layout of text with 79 characters per row and above should be readable and legible enough for reading texts on iPad; considering quality of reading, texts displayed on iPad can replace texts printed on paper. Keywords: iPad; legibility; readability; text Čitkost i čitljivost teksta na iPadu i usporedba s čitanjem s papira i zaslona računalaIzvorni znanstveni rad U radu autori istražuju čitkost teksta na iPad uređaju i djelomično ga uspoređuju s čitanjem sa zaslona računala i papira. Na temelju ranijih istraživanja, mjerene su dvije nezavisne varijable: brzina čitanja (T) i subjektivna težina čitanja (Z). U istraživanju je sudjelovalo 220 studenata starih između 18 i 48 godina podijeljeno u 11 grupa od po 20 sudionika. Ključni rezultati su: Sans serif font Gotham čitkiji je i čitljiviji na iPadu od Minion Pro serifnog fonta, iako kad su veličine fonta veće, nema statistički značajne razlike između njih; zbog manjeg broja znakova po retku, dvostupačni prijelom najteže je čitljiv; tekst prelomljen u minimalno 79 znakova po retku i više dovoljno je čitak za čitanje na iPadu; s obzirom na kvalitetu čitanja, tekstovi prikazani na iPadu mogu zamijeniti tekstove tiskane na papiru.

Original scientific paper In this paper the authors determine the visual interest centres and the points of visual entry of observers on the page of graphical user interface for newspaper tablet application using the method of monitoring the eye movement. The research presented in this paper demonstrates that the key visual elements and points of entry in this case function in the same way as in the case of the printed edition of daily newspapers, and do not follow the patterns that occur in the application of content on websites of corresponding newspaper. Keywords: eye tracking, graphical user interface; newspaper layout; points of visual interest; tablet applicationsDeterminiranje točaka vizualnog interesa kod grafičkih korisničkih sučelja aplikacija za tablet novine Izvorni znanstveni članak U radu autori metodom praćenja kretanja oka određuju centre vizualnog interesa i točke ulaza pogleda promatrača na stranicu grafičkog korisničkog sučelja aplikacije za tablet novine. Istraživanje prikazano u radu pokazalo je da ključni vizualni elementi i točke ulaza u ovom slučaju funkcioniraju na isti način kao i kod tiskanog izdanja dnevnih novina, a ne slijede obrasce koji se javljaju kod prikaza sadržaja na web stranici pripadajućih novina.Ključne riječi: grafičko korisničko sučelje; praćenje kretanja oka; prijelom novina; tablet aplikacije; točke vizualnog interesa

Abstract:The top dot shape is an important element of plate dot geometry which has a significant effect on dot formation on the prints. There are several key parameters that can affect individual dot deformation: nip engagement, line ruling and dot geometry. The main question is how these parameters affect dot deformation. This paper researches the issues regarding print quality in highlights, especially dot formation on print at lighter and higher pressure which leads to inconsistency in the printing process like loss of highlight detail and unpredictable dot gain. The purpose of this research is to improve the understanding of the effect of nip engagement on dot deformation and to determine how top dot shapes affect dot formation. A test image was printed with cyan UV ink on aluminium foil on the pre-printed opaque white ink with plates of different types of top dot shapes, round and flat. The images were taken from the prints and analysed by using ImageJ software. All the important parameters of dot formation including uniformity of density, dot sharpness and dot roundness were evaluated. The results highlight the importance of the top dot shape in plate dot geometry which has a significant effect on print dot formation.

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