This paper aims to provide a foundation in regard to information and cause correlation for future research about player retention and game session times based on visual properties. (such as colour values) This study can later be applied within software development. An online quantitative survey about play sessions and player habits is conducted and the conduct of this research is aimed at helping art directors make conscious and deliberate choices about the art styles for products where the visuals may impact player retention and game sessions. By knowing how visual elements such as colour values, shapes and contrast impact game play intensity and player engagement, and ultimately the end time spent during play sessions, art directors can make informed decisions to help impact player behaviours and habits.The paper includes subjects such as colour effects on humans (mental and physical), how human eye sight functions and how this should affect designs, effective use of visuals, eye fatigue, and visual communication.This study of visual properties and play sessions concludes that visuals have a definitive impact on how the game is perceived and processed by the player, leading to situations where the same mechanics can be much more intensive if presented using specific forms of visuals. / Uppsatsen är ämnad att skapa en grund för information och korrelationer mellan speltider och bibehållande spelsessioner baserat på visuella egenskaper (ex färgvalörer). En undersökning av spelsessioner och spelarvanor är utförd med sikte på att hjälpa art directors att göra medvetna och avsiktliga beslut om spelutseende för produkter där det visuella kan påverka spelsessioner. Genom att veta hur visuella element, så som färgvalörer, former och kontrast påverkar spelintensitet och spelarengagemang och slutgiltigt tiden spenderad under spelsessioner, så kan art directors göra informerade beslut för att påverka beteende och vanor.Uppsatsen inkluderar områden såsom färgeffekter på människor (mentala och fysiska), ögonfunktioner och hur dessa borde påverka design, effektivt användande av grafik, ögontrötthet och visuell kommunikation.Denna studie av visuella egenskaper och speltider drar slutsatsen att visuella effekter har en definitiv inverkan på hur spelet uppfattas och bearbetas av spelaren, vilket leder till situationer där samma spelmekaniker kan vara intensivare om dessa presenteras på specifika visuella sätt.

Colour coding is seen in various forms throughout different types of media and in reallife. This study focuses on what effect colour coded visuals can have on a player in avideo game, using lights and environments deliberately coloured in a specific way togain the players attention. Results suggest that colour coding aids the player inunderstanding where to go in the game and what something means. Participantsexpressing their ability to traverse levels in the game with ease thanks to theirunderstanding of what a colour may imply. The participants selected for the test havevaried in skill, age and gender to avoid any form of bias. Further prevention of biaswas done through the between-subjects method where the subjects always started on arandom level. / Färgkodning ses i olika former inom media och verkliga livet. Denna studie fokuserarpå vad för effekt färgkodade visuella element kan ha på en spelare i ett videospel, medhjälp av ljus och miljö i ett videospel med avsiktlig färgkodning för att vägledaspelaren och fånga dennes uppmärksamhet. Resultaten föreslår att färgkodning hjälperspelaren att förstå vart de ska gå i datorspelet, samt vad något betyder. Deltagare anseratt deras förmåga att ta sig igenom spelets nivåer var enkelt tack vare deras förståelseav vad en färg kan antyda. Deltagarna valda för studien varierade i förmåga, ålder ochkön för att förhindra någon form av partiskhet. Vidare förebyggande av partiskhetgjordes via mellan-deltagare metoden, där deltagare startade på en slumpad nivå.

The study aims to achieve an understanding of the artist’s materials and techniques used by Lucky Madlo Sibiya when he created his carved and painted wood panel artworks. A survey of the artist’s materials and techniques is of great importance, because he is represented in multiple institutional, corporate and private collections – including the University of Pretoria. His carved and painted wood panel artworks are also reaching an age (at least 20 years old, as 2019 is the twentieth anniversary of his death) when they would soon require conservation and restoration, if not stored and displayed according to sound conservation conditions and standards. For best-practice conservation and restoration, in-depth knowledge of the materiality of an artwork is needed. In order to reach an in-depth knowledge of the materiality of Sibiya’s carved and painted wood panel artworks, the survey intends to examine and document through the combination of various historical, visual and analytical techniques artworks with unrefuted provenance. The analytical techniques used are popular in heritage conservation, because they are non-invasive and non-destructive. They include provenance studies, visual examination, technical photography, X-ray Fluorescence and Fourier-transform Infrared Spectroscopy. In combination, the techniques should reveal the materials and techniques Sibiya employed. This knowledge will be used to safeguard and preserve this part of South African art heritage. / Mini Dissertation (MSocSci)--University of Pretoria, 2020. / Tangible Heritage Conservation / MSocSci (Tangible Heritage Conservation) / Unrestricted

Presented thesis deals with the complex characterization of extracts from medical plants using spectroscopic and chromatographic techniques, with emphasis on the influence of solvent, post-harvest treatment of the sample, location and year of production on selected parameters. Part of the work is devoted to application of selected extracts from medical plants in suitable form into beverages. The thesis is divided into two parts. At the first part of the work combination of electron paramagnetic resonance, ultraviolet visible spectroscopy, liquid chromatography and inductively coupled plasma optical emission spectrometry was applied for characterization of aqueous, ethanol and dimethylsulfoxide extracts from 10 selected medical plants, which were collected from two different locations during two years (2015, 2016) and post-harvestly treated by two ways (freezing, drying). In total, 39 parameters were determinated: namely total phenolic compounds content, total flavonoids content, 14 specific phenolic compounds, colour characteristics in the CIE L*a*b* system (L *, a*, b *, C*, h°, BI), radical-quenching activity using the cation radical of the 2,2'-azino-bis- (3-ethylbenzothiazoline-6-sulfonic acid), antioxidant/pro-oxidant activity using the spin trapping technique in the presence of 5,5-dimethyl-1-pyrrolin-N-oxide (DMPO)/potassium peroxodisulphate and content of 15 minerals (Al, As, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, P, Pb, Zn). The results confirmed that the studied parameters of medical plants are influenced by the extraction system, post-harvest treatment of samples, year of production, origin of samples (locality) and species composition. It has been shown that the type of extraction solvent significantly affects the composition of the extracts. On the basis of these analyzes, for food application – the isolation of the main functional components (phenolic compounds, flavonoids) –50% ethanol, post harvest treatment by drying and samples of Mentha piperita, Melissa officinalis, Hypericum perforatum and Salvia officinalis were selected. The second part of the thesis was focused on the application of selected extracts of medical plants to beverages (syrups). The above mentioned plants, 25% ethanol instead of 50% ethanol (due to the limitation of the ethanol content in final raw material), were selected for the application. At first, extraction of medical plants was optimized. Suitable ratio of material and solvent (1:10), extraction time (8 h) and herb absorbency (50–62 %) were determined. The prepared extract after filtration was applied to the syrup concentrate in different ratios to produce one-species syrups and further sensorially tested to select the suitable recipe, the best flavour and basis for the production of two-species syrups. The mint syrup was the most tasty and generally the most acceptable one-species syrup, and sage syrup was selected as the basis for two-species syrups. Further, the most appropriate recipes of the two-species syrups were chosen, the most sensorially acceptable one was selected and further tested if it would be appropriate to colour them. Preferentially, it has been found that it is not necessary to colour two-species syrups. On the basis of the sensory analysis, it has been found that peppermint and sage-peppermint syrups were the most tasty and acceptable syrups, which could be, after further testing, produced industrially to enrich the food market.

The aim of this work is to realize a system in the Matlab-Simulink environment, which will be able to detect and recognize the human face from the input image. The created model will actually simulate the biometric security systems working on the principle of face recognition. The work is divided into two parts. In the first part, several methods for face detection from image are described. We focused on the symptomatic oriented and color segmentation methods. The pattern matching method is also described and implemented; the advantage ofthe pattern matching that it can be used either for face detection or face recognition. The second part of this work contains a description of the face recognition. Where PCA (Principal Component Analysis) are used for this task, this part of the work also includes experimental results of tests performed on our methods.

Inkjet printing technology became a popular technology for printing digital photographs in the last decade. There is a big variety of both original and alternative (cheaper) inks and print media for the consumers. But there is a question if the cheaper material provides also comparable printout quality. For this reason, it is important to test the properties of such inkjet printouts. There are several ways how to test the lightfastness of the printouts: long term storage under environmental conditions, or short, accelerated ageing tests. The stability of printouts is affected by many factors, such as ink-receiving layer, ink composition, UV and visible light intensity and air pollutants concentration in the environment. Some inkjet printouts exposed to light usually undergo surprisingly fast fading, but light is not the only dangerous condition for inkjet printout. The two types of test targets printed with dyebased inkjet inks on various paper types were subjected to both accelerated test in a xenon test chamber and light and environmental pollutants long-term test in a sunny indoor corridor. The values of light intensity were continuously monitored and samples properties were regularly measured with a spectrophotometer. Another type of testing included accelerated ozone ageing of inkjet dyes. The colour gamuts and gamut volumes were calculated from collected spectral data. Total colour difference E*ab was also evaluated, its increase served as a tool for finding the formal printout degradation rate constant. It was found out that the dyes in ink-receiving layers of printouts underwent significant degradation in all tested conditions. The degradation rate depended on the type of used print media. The reciprocity behaviour of printouts was also studied. Recent inkjet printouts testing miss some actual ISO norm which should show the way of effective lightfastness evaluation. One of the main aims of this work was to find some new and alternative ways of inkjet printouts lightfastness evaluation. The method of printed inks concentration determination from the test charts spectrophotometric measurements was also proposed.

Le blanc dans le cinéma de science-fiction vibre et scintille, comme une invitation à l’interpréter. À travers le blanc se tisse un lien entre des images sans rapports apparents, et ce type de connexion hétérogène sollicite notre regard d’une manière qui se rapproche d’un montage. Ce regard facilite de plus le détachement des figures blanches de leurs objets référentiels, du contexte du film, et même du contexte du cinéma. Dans cette vision en forme de constellation, révélant des forces liées à la construction, à la destruction et à l’incertitude, le blanc au sein du cinéma de science-fiction, de par sa nature hybride et changeante, transgresse fréquemment les lois établies de l’espace-temps. Véhiculant des sensations et des pensées variées, le blanc reflète d’une manière indirecte et fragmentaire son époque et révèle avec subtilité son passé virtuel, lequel se caractérise par une grande richesse. À la fois couleur du degré zéro et couleur intégrale, porteur de mémoire tout autant que de nouveauté, le blanc, en raison de son caractère minimal et illimité, démontre une capacité à se déplacer librement dans le monde de la science-fiction, voire d’errer dans l’univers des images... / The colour white in the cinema of science fiction vibrates and sparkles, inviting our interpretations. Unrelated images are linked through whiteness in a form of heterogeneous connection that solicits our gaze as a montage. This look also facilitates the detachment of white figures from their reference objects, the context of the film and even the context of cinema. In this vision of a constellation, which reveals the energies of construction, destruction and uncertainty, whiteness in the cinema of science fiction by its hybrid and changing nature easily transgresses the established laws of space-time. Carrying diverse sensations and thoughts, the colour white reflects its era in a manner at once both indirect and fragmentary, discreetly revealing its virtual but rich past. At once the colour of nothingness and integrating all other colours, saturated with memory but new like a newborn, white with its minimal and unlimited character demonstrates an ability to move freely in the world of science-fiction, and even to wander in the universe of images.

Thesis (MSc. (Horticulture)) -- University of Limpopo, 2019 / After harvesting litchi fruit, the red pericarp colour is rapidly lost resulting in discolouration and browning during storage and marketing. To mitigate this challenge, the South African litchi industry uses sulfur dioxide fumigation to retain litchi fruit red pericarp colour during extended storage and shelf-life. However, there are health concerns regarding the commercially used (SO2) fumigation for litchi pericarp colour retention due to high levels of SO2 residues in fruit aril. Therefore, this study aimed to explore the possibility of Uvasys slow release SO2 sheets to retain ‘Mauritius’ litchi fruit red pericarp colour when packaged in plastic-punnets and bags. Treatment factors were two packaging materials (plastic-punnets and bags), six SO2 treatments (control; SO2 fumigation and four SO2 sheets viz. Uva-Uno-29% Na2S2O5; Dual-Release-Blue35.85% Na2S2O5; Slow-Release-36.5% Na2S2O5 and Dual-Release-Green-37.55% Na2S2O5) and four shelf-life periods (day 0, 1, 3 and 5). ‘Mauritius’ fruit were assessed for pericarp Browning Index (BI), Hue angle (ho), Chroma (C*) and Lightness (L*). In this study, an interactive significant effect (P < 0.05) between packaging type and SO2 treatments was observed on ‘Mauritius’ fruit pericarp L*, C* and ho during shelf-life. Fruit stored in plastic-bags and treated with SO2 fumigation showed higher pericarp C* and L*, while SO2 fumigated fruit in plastic-punnets had higher pericarp ho. Lower pericarp BI was observed in SO2 fumigated fruit stored in plastic-bags, which showed less pericarp browning than fruit in other treatments. In general, commercial SO2 fumigation resulted in lower pericarp BI, and higher pericarp L*, C* and ho throughout the storage and shelf-life. Our correlation analyses results further showed that litchi fruit red pericarp colour was better preserved as SO2 treatment levels increased, especially in plastic-bags. In retaining ‘Mauritius’ litchi fruit red pericarp colour, Uvasys SO2 sheets were not effective when compared with commercial SO2 fumigation. However, commercially SO2 fumigated fruit were bleached throughout the storage and shelf-life. Furthermore, fruit from all treatments were spoiled due to decay and mould growth after day 5 of shelf-life. Inclusion of pathogen protectants is important in future research to demonstrate whether Uvasys SO2 sheet-packaging technology can retain ‘Mauritius’ litchi fruit pericarp colour. / Agricultural Research Council and National Research Foundation (NRF)

No description available.

SyAet med denna studie var a&lt; förstå hur konsumenter i Sverige med olika könsroller och åldrarupplever elektroniska (e-) handelswebbsidor som =llförlitliga baserat på den visuella designen.SyAet besvarades genom a&lt; undersöka färg- och typografins påverkan på upplevd =llförlitlighet före-handelswebbsidor, u=från konsumentens perspek=v.År 2021 används e-handeltjänster alltmer för a&lt; köpa produkter. Företag kan numera nå ut =ll fleroch större målgrupper genom e-handel då företagets geografiska belägenhet inte längre äravgörande för kunden. EAersom e-handelsmarknaden växer och konkurrensen blir allt hårdare, ärdet vik=gt a&lt; företagen är medvetna om dess visuella presenta=on på webbsidan för a&lt; fåkonsumenternas =llit. Resultat av =digare studier visar a&lt; färg och typografiska val är vik=ga faktorerför huruvida en webbsida upplevs =llförlitlig. Tidigare forskning visar även på hur olika kön och åldrarförhåller sig =ll internet och hur olika deras användningsmönster ter sig vad gäller teknologi.Denna studie uUördes med hjälp av en visuell innehållsanalys och en enkätundersökning. Resultatenfrån den visuella innehållsanalysen gav verktyg =ll a&lt; skapa fik=va webbsidor med olika färg ochtypsni&lt;, som vidare användes i enkätundersökningen. Totalt tolv e-handelswebbsidor skapades =llenkätundersökningen för a&lt; utreda vilken färg samt typsni&lt; som upplevs vara mest =llförlitlig.Studien indikerade jämna resultat mellan åldersgrupper samt könsroller vad gäller upplevelse av=llförlitlighet u=från färg- och typografival på e-handelswebbsidor. Resultatet visade tendenser =lla&lt; den orangea samt gula webbdesignen upplevdes minst =llförlitliga enligt respondenterna i dennastudie. Något mer =llförlitliga upplevdes färgerna grön, blå, röd och rosa. Studien indikerade a&lt;sanserif-typsni&lt; ansågs något mer trovärdigt än seriff-typsni&lt;. / The purpose of this study was to understand how credible consumers in Sweden with differentgender roles and ages perceived electronic (e-) commerce websites based on the visual design. Thepurpose was answered by examining the impact of colour and typography on perceived credibilityof e-commerce webpages from the consumers’ perspec=ve.In 2021, e-commerce services are increasingly being used to purchase products. Businesses cannowadays reach a much larger market through e-commerce, as the geographical loca=on of thecompany is not anymore cri=cal to customer availability. As the e-commerce market grows evenlarger, companies should be more aware of their visual presenta=on on the website to gainconsumer trust. Previous studies show that colour and typographic choices are important factors inwhether a webpage is perceived trustworthy. Previous research gives insight to how different genderroles and age groups relate to the internet and have different usage pa&lt;erns.This study was carried out using a visual content analysis and a ques=onnaire. The results of thevisual content analysis gave the prerequisites for crea=on of the fic=onal webpage layouts withdifferent colours and typefaces that were further used in the ques=onnaire. A total of twelve ecommercewebpage were created for the ques=onnaire to inves=gate which colours and typefacesare experienced to be most credible.The study indicated even results between age groups and gender roles in terms of experience ofcredibility regarding colour and typography choices on e-commerce websites. The results showedtendencies that the orange as well as yellow webdesigns were the least credible according torespondents in this study. Green, blue, red, and pink were considered more credible than orangeand yellow designs. The study also indicated that sans serif typeface was considered slightly morecredible than serif typeface.