Different Textile Materials as Light Shaping Attachments in Studio Photography and Their Influence on Colour Reproduction

Abstract

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 thus the quality of the reproduced colours. This was evaluated by analysing the colour differ¬ences which were calculated from the colorimetric values of the colour patches of the X-Rite ColorChecker Passport test chart. Test chart was photographed in a controlled environment and illuminated with different combinations of light sources and tested fabrics. The results confirmed that not all combinations of variables are suitable for use if the goal of the photograph is to achieve high quality colour reproduction.

Shadow Segmentation With Image Thresholding for Describing the Harshness of Light Sources

“…the size, shape and material properties of the attached light modifiers. The material composition, surface properties and porosity of the material play a crucial role in the effect on the original light [1], [3], leading to a variety of possible application combinations. While geometric projection helps to predict shadows to a certain extent, it has the limitation that it ignores the influence of the materials used in the potential light modification.…”

“…The second input was a captured image, which we first converted from RAW format to JPG format, ignoring the camera's calibration profiles and applying no gamma correction to keep the recognized data as close as possible to the captured data. In the next step, we converted the image to grayscale according to (1), saved it as a test image and again detected the ,(-, , 𝑦 *+ ,(-, ) (Fig. 2b).…”

“…Our ongoing research aims to characterize artificial light sources and the influence of light-shaping attachments on the original light. While in our previous research [1], [2], [3] we have investigated the influence of light-shaping attachments on color properties of a light source using widely used metrics such as color differences in the CIE Lab color space and the color rendering index (CRI), we have not encountered an available metric that would describe the harshness of a light source, let…”

Quality of Colour Rendering in Photographic Scenes Illuminated by Light Sources with Light-Shaping Attachments

“…Recent studies have explored how colour influences the perception of real objects, such as translucent materials [1,2], and have highlighted the nuanced interplay between light, material properties and colour rendering. Research into the role of colour in the visual-tactile discrimination of materials [3] adds another layer and shows how sensory perception is closely linked to colour.…”

Proceedings - The Eleventh International Symposium GRID 2022

“…There are different ways to deal with light in a photo studio (Gunde et. al., 2009;Hough, 2013;Štampfl, Možina & Ahtik, 2021). There are also different approaches to normalising colour reproduction in relation to the colour of the surrounding space using colour management (Ahtik, 2017), where we calculate ICC (Morris, 2005) or DNG (X-Rite, 2022) colour profiles.…”