Browsing NTNU Open by Author "Green, Philip John"
Now showing items 1-20 of 27
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A Model of Visual Opacity for Translucent Colorants
Midtfjord, Helene B.; Green, Philip John; Nussbaum, Peter (Journal article; Peer reviewed, 2018)Potential methods for predicting the visual impression of the opacity of translucent white ink were evaluated. An experiment was conducted to collect visual data for white ink coatings on three different substrates: white ... -
An Appearance Reproduction Framework for Printed 3D Surfaces
Habib, Tanzima; Green, Philip John; Nussbaum, Peter Stefan (Peer reviewed; Journal article, 2023)Bidirectional reflection distribution function (BRDF) is used to measure colour with gloss and surface geometry. In this paper, we aim to provide a practical way of reproducing the appearance of a 3D printed surface in ... -
Benchmarking modern gloss correlators with established ISO 2813 standard and visual judgement of gloss
Saric, Donatela; Kraushaar, Andreas; Mattuschka, Marco; Green, Philip John (Journal article; Peer reviewed, 2021) -
Building a metric of color reproduction difference by combining multiple observers in a modular online experiment
High, Gregory Paul; Nussbaum, Peter Stefan; Green, Philip John (Peer reviewed; Journal article, 2023)A web-hosted online experiment was previously developed to find the visual difference between four reproduction gamuts using direct magnitude estimation (Proc. IS&T 29th Color and Imaging Conf, 2021:317–322). In order to ... -
Chromatic adaptation in colour management
Green, Philip John; Habib, Tanzima (Journal article; Peer reviewed, 2019)Chromatic adaptation transforms are used to predict corresponding colours viewed under a different adapting illuminant. In colour management it is often necessary to apply such a transform in order to achieve a ... -
Color appearance processing using iccMAX
Derhak, Max; Green, Philip John; Conni, Michele (Journal article; Peer reviewed, 2018)ICC.2:2017 is a revision to the next-generation colour management specification iccMAX that introduces new support for colour appearance processing. iccMAX includes a built-in colour appearance model IccCAM, together with ... -
Comparison of Hyperspectral Imaging and Fiber-Optic Reflectance Spectroscopy for Reflectance and Transmittance Measurements of Colored Glass
Babini, Agnese; Green, Philip John; George, Sony; Hardeberg, Jon Yngve (Peer reviewed; Journal article, 2022)The work presented in this paper is part of a wider research project, which aims at documenting and analyzing stained glass windows by means of hyperspectral imaging. This technique shares some similarities with UV-VIS-IR ... -
The effect of camera calibration on multichannel texture classification
Conni, Michele; Nussbaum, Peter; Green, Philip John (Peer reviewed; Journal article, 2021)Abstract The efficiency of a texture classification procedure depends on the color space in which it is performed. Classification in a perceptually meaningful space requires chromatic coordinates obtained from a calibrated ... -
Estimating visual difference between reproduction gamuts: moving our pilot study from the lab to online delivery
High, Gregory Paul; Nussbaum, Peter; Green, Philip John (Chapter, 2021)Images reproduced for different output devices are known to be limited in the range of colours that can be reproduced. It is accepted that reproductions made with different print processes, and on different substrates, ... -
Estimation of BRDF Measurements for Printed Colour Samples
Habib, Syeda Tanzima; Green, Philip John; Nussbaum, Peter (Journal article; Peer reviewed, 2021)In this paper, we describe a method to estimate BRDF measurements for different printed colours, using just the BRDF measurements of the substrate and the primary inks. A model is trained using the BRDF measurements of the ... -
Fast chromatic adaptation transform utilizing Wpt (Waypoint) based spectral reconstruction
Derhak, Maxim W.; Luo, Eric Lin; Green, Philip John (Chapter, 2020)Burns previously showed that a chromatic adaptation transform (CAT) implemented using spectral reconstruction with lightness preserving produces comparable predictive results of corresponding color data sets as optimized ... -
Grey Balance in Cross Media Reproductions
High, Gregory Paul; Nussbaum, Peter Stefan; Green, Philip John (Peer reviewed; Journal article, 2023)Grey balance plays an important role in determining the device values needed to reproduce colours which appear achromatic throughout the tonal range. However, complete observer adaptation to the media white rarely occurs, ... -
The Helmholtz-Kohlrausch effect on display-based light colors and simulated substrate colors
High, Gregory Paul; Green, Philip John; Nussbaum, Peter Stefan (Peer reviewed; Journal article, 2023)The Helmholtz-Kohlrausch (H-K) effect is investigated in relation to light colors of every hue, including those typical of print substrate colors that might be simulated on a graphic arts display. A method of adjustment ... -
How accurate is an online test for colour vision deficiency?
Gjærde, Kari Bjerke; Kvitle, Anne Kristin; Green, Philip John; Nussbaum, Peter (Journal article, 2021)This study explores the accuracy and specificity of an on-line version of a standardized colour vision deficiency test – the Hardy-Rand-Rittler test (HRR) performed in an uncontrolled environment. A group of 25 observers ... -
The impact of surface properties on photovoltaics' colour angular sensitivity: A comparison study for façade integration
Xiang, Changying; Green, Philip John; Matusiak, Barbara Szybinska (Peer reviewed; Journal article, 2021)Façade integrated photovoltaics are a promising way to employ renewable energy technology in the built environment. The colours of façade integrated photovoltaics are essential to the overall aesthetic quality of buildings, ... -
The impact of the Helmholtz-Kohlrausch effect on the appearance of near-white paper colours
High, Gregory Paul; Green, Philip John (Chapter, 2021)This paper investigates the impact of the Helmholtz-Kohlrausch effect on near-white substrate colours. As the luminance of the test colour (or its simulated reflectance in a softproof setup) approaches that of the adapting ... -
The Influence of Wedge Angle, Feedstock Color, and Infill Density on the Color Difference of FDM Objects
Payami Golhin, Ali; Strandlie, Are; Green, Philip John (Peer reviewed; Journal article, 2021)The surface appearance in additive manufacturing (AM) has attracted attention in recent years due to its importance in evaluating the quality of 3D printed structures. Fused Deposition Modeling (FDM), also known as Fused ... -
The Influence of Wedge Angle, Feedstock Color, and Infill Density on the Color Difference of FDM Objects
Golhin, Ali Payami; Strandlie, Are; Green, Philip John (Peer reviewed; Journal article, 2021)The surface appearance in additive manufacturing (AM) has attracted attention in recent years due to its importance in evaluating the quality of 3D printed structures. Fused Deposition Modeling (FDM), also known as Fused ... -
Methods for psychophysical assessment of colour difference by observers with a colour vision deficiency
Kvitle, Anne Kristin; Oddløkken, Henrik; Green, Philip John; Nussbaum, Peter (Chapter, 2018) -
A Model of Consistent Colour Appearance
High, Gregory (Doctoral theses at NTNU;2024:309, Doctoral thesis, 2024)Cross-media colour reproduction is the process of printing or displaying text, graphical objects and pictorial images across a wide range of imaging devices, each with its own set of limitation in terms of colour and other ...