Jure Ahtik

• PhD
• Professor (Associate) at University of Ljubljana

Light sources are usually described by luminous intensity, color temperature and color rendering index, while the harshness of the light source is often overlooked. It is also referred to as the softness or light quality and can be determined by analyzing the shadows it produces. Shadow detection is often addressed in image analysis research, but t...

Featured Application The research results provide guidelines for the lighting of photographic scenes where accurate colour reproduction is important. Abstract In both commercial and scientific photography, achieving accurate colour reproduction is essential. This study investigates the influence of light-shaping attachments on colour rendering ind...

The phenomenon of cracking in paper coatings was investigated. Coating mixtures were compared according to their composition, the effects of cracking in the coating were determined, and certain combinations of the components of the base paper and the paper coating showed the lowest tendency to cracking. It was shown that the appropriate selection o...

Design plays a major role in online advertising. While specific aspects such as color or animation have been extensively studied, there is a surprising lack of comprehensive research on the overall impact of visual design and aesthetics. This study delved into the effects of varying levels of visual complexity in banner ads using the eye-tracking m...

When lighting photographic scenes, light sources are often coupled with light-shaping attachments to alter the original light. While the colour rendering properties of the light sources are known, the effect of the added modifiers has not yet been fully investigated. In this research, the effects of light-shaping attachments such as snoot, beauty d...

The properties of photographic light sources are often described in terms of the type of light source, its power, colour temperature, colour rendering index, and often its distance from the observed scene. These properties affect the lighting conditions at the scene and can be critical to accurate colour reproduction in images. However, light-shapi...

The photographer's awareness of the light in the scene is the key to good exposure, whether it is technically correct or an expression of creativity. The article deals with the role of light and its absence, shadow, in the field of photography. Several studies from history and the present are presented, linking the perception of light and its shado...

The goal of the study was to determine how close the eye-tracking results predicted by the AI model are to actual measurements and whether they can be used in scientific research or in real business cases. The study was based on a carefully prepared photo database of 30 photos of varying complexity and colour. The photos were shown to 110 participa...

Using a static or animated information on a medium, such as a poster, is a common decision to be made nowadays. Advertising solutions in the form of a screen that mimics a traditional poster format offer us a way to bring to life something that has been static for more than a century. Deciding if and when it is better to use an animated rather than...

Lighting conditions are one of the most important factors for good photographic exposure. In enclosed spaces, like a photography studio, we can control the light in several ways. We can adjust the type of light source, the shape of the light source, its intensity, and in some cases the colour temperature of the emitted light. The distance of the li...

When it comes to the function of photography in graphic communication, we should be aware of many different aspects of the medium. The standard criterion for a correct and successful photograph should always be its technical and artistic aspect. If something is not right, for example, if the exposure or composition are not correct, a photo should n...

The paper presents an interdisciplinary approach to the treatment of the FormaViva collection of wooden sculptures exhibited outdoors in a natural environment near the Božidar Jakac Art Museum in Kostanjevica na Krki in Slovenia. The study focuses on 3D graphic representations of sculptures created with photogrammetry and 3D modelling. The results...

"The phenomenon of paper coating cracking when folded was studied. Coating mixtures were compared according to their composition, applied on different base paper, to find which combinations of the constituents of the base paper and the paper coating results in a lower tendency towards fold cracking of the coating layer. It was shown that the approp...

The research focuses on the quality of colour reproduction when using different light sources, often used to illuminate scenes in a photo studio, and different types of fabrics as lighting shapers. With the latter, the light can be converted into softer and more diffuse light, but the properties of the fabrics used affect the colour impression and...

Image quality can be determined by using objective or subjective quality assessment methods. Objective methods are based on mathematical measures, such as PSNR, SSIM or RMSE and subjective testing is generally performed by asking the participants which of the given options they prefer or to give a quality score for the presented options. For each i...

The characteristics of phosphorescent pigments screen printed on polyester and cotton fabric were studied in the research. The phosphorescent pigments are special pigments that glow in the dark after exposure to light. The aim of the research was to determine the length of the luminescent activity of phosphorescent pigments in the dark after exposu...

Nowadays, urban environments are changing and expanding very fast, since people are moving to cities to get jobs, more opportunities and generally a better life. To gain control of this fast development and building projects, orthophotography images are used to display actual land and building features. In our research, the aerial images, acquired...

Anaglyph images are a way of representing of spatial images on a flat surface. They are made with combining two images or two stereo pairs. The principle of anaglyph images is based on different colour of left and right images and colour filters (3D glasses), through which we perceive the image. The possibility of printing of anaglyph images to tex...

To adjust the colour of an object to the colours in an environment, it is necessary to defi ne a precise and objective method. Spectroradiometry enables the measuring of refl ected light from the surface of an object at larger distances, where the important role is that of the baseline observation. The aim of this study was thus to determine how th...

Every chromogenic switchable window gives rise to considerable change of spectral power distribution of the light crossing trough. The filtered light continuously changes during charging/discharging of the device, seen as its coloration/discoloration. As this process occurs continuously, it causes continuous change of colors on an illuminated multi...