EFFECTS OF LUMINOUS COLOUR SHIFT Duv ON COLOUR PREFERENCE

2021 ◽  
Author(s):  
M. Koyama ◽  
E. Mochizuki
Keyword(s):  
Subjective Evaluation ◽  
Combined Effect ◽  
Entire Space ◽  
Colour Preference ◽  
Colour Difference ◽  
Colour Temperature ◽  
Interior Surface ◽  
Acceptable Range ◽  
Subjective Experiment

Subjective experiment was carried out to investigate the combined effect on the colour preference of the interior style, correlated colour temperature (CCT) and duv. Twenty university age subjects evaluated all 28 conditions with 2 types of the interior style, 2 levels of the CCT and 7 levels of the duv. This paper reports the measured results of the chromaticity shift of the interior surface due to duv and the perception of the colour difference between the condition with any other duv and that with duv0. Subjective evaluation on the colour preference of the entire space related to the interior style, CCT and duv is also summarized. It is concluded that the acceptable range of duv to be classified as the same CCT should be reconsidered, considering colour preference.

Towards a user preference model for interior lighting, Part 3: An alternative model

2019 ◽  
Vol 52 (2) ◽  
pp. 189-201
Author(s):  
TQ Khanh ◽  
P Bodrogi ◽  
X Guo
Keyword(s):  
Alternative Model ◽  
User Preference ◽  
Colour Preference ◽  
Type Representation ◽  
Contour Map ◽  
Preference Model ◽  
Colour Temperature ◽  
Independent Variables ◽  
Interior Lighting ◽  
Present Part

In Parts 1 and 2 of this work, an experiment was described in which subjects assessed their visual impressions of scene brightness (B), visual clarity (VC), colour preference (CP) and scene preference (SP) in a real room. In this room, the horizontal illuminance ( Ev), the correlated colour temperature (CCT) and the level of chroma enhancement caused by the spectrum of the light source (Δ C*) were changed systematically. In the present Part 3, these mean subjective B, VC, CP and SP scale values are re-analysed in terms of an alternative model based on a different set of independent variables: CCT, Δ C* and the circadian stimulus (CS). Contour map diagrams resulting from the new modelling equations are shown and compared with the conventional Kruithof-type representation.

Colour preference, naturalness, vividness and colour quality metrics, Part 1: Experiments in a room

2016 ◽  
Vol 49 (6) ◽  
pp. 697-713 ◽  
Author(s):  
TQ Khanh ◽  
P Bodrogi ◽  
QT Vinh ◽  
D Stojanovic
Keyword(s):  
Quality Metrics ◽  
Saturation Effect ◽  
Light Sources ◽  
Quality Indices ◽  
Colour Preference ◽  
Colour Temperature ◽  
Semantic Categories ◽  
Interval Scales ◽  
Office Lighting ◽  
Spectral Design

In Part I of this work, observers scaled colour preference, naturalness and vividness visually on interval scales (0–100) labelled by semantic categories (e.g. ‘moderate’, ‘good’ and ‘very good’) in the context of office lighting. Five customary light sources without object saturation effect illuminated a table with coloured objects in a real room. The observers’ assessments were predicted by recent colour quality indices and selected pairs of indices combined linearly. Criterion values of the indices for ‘good’ colour preference and vividness were determined to provide a usable acceptance limit for the spectral design and evaluation of light sources. To predict colour preference, correlated colour temperature turned out to be useful. In Part 2 of this work, another experiment with the same method but using multi-LED spectra with more object saturation will be analysed and the two datasets will be merged.

Interactive effect of illuminance and correlated colour temperature on colour preference and degree of white light sensation for Chinese observers

Optik ◽  
2020 ◽  
Vol 224 ◽  
pp. 165675
Author(s):  
Yu Wang ◽  
Qiang Liu ◽  
Wenyu Gao ◽  
Michael R. Pointer ◽  
Zheng Huang ◽  
...  
Keyword(s):  
White Light ◽  
Interactive Effect ◽  
Colour Preference ◽  
Colour Temperature

Colour preference, naturalness, vividness and colour quality metrics, Part 4: Experiments with still life arrangements at different correlated colour temperatures

2017 ◽  
Vol 50 (6) ◽  
pp. 862-879 ◽  
Author(s):  
TQ Khanh ◽  
P Bodrogi ◽  
QT Vinh ◽  
X Guo ◽  
TT Anh
Keyword(s):  
Quality Metrics ◽  
Still Life ◽  
Colour Preference ◽  
Colour Temperature ◽  
Led Light ◽  
Significant Dependence ◽  
Subjective Judgments ◽  
Light Engine

Subjective colour preference, naturalness and vividness assessments of two different colourful still life arrangements viewed in a real room were analysed and modelled with the aid of the Rf colour fidelity metric combined with a chroma difference metric. Coloured objects were illuminated by a four-channel LED light engine with 36 different spectra at four correlated colour temperatures and nine object oversaturation levels. Results imply a significant dependence of the subjective judgments on correlated colour temperature.

scholarly journals Subjective Effects of Sound Absorption and Investigation of Reverberation Times in Modern Japanese Dwellings

2021 ◽  
Vol 11 (6) ◽  
pp. 2709
Author(s):  
Kazuma Hoshi ◽  
Toshiki Hanyu ◽  
Ryoichi Suzuki ◽  
Daisuke Watanabe
Keyword(s):  
Sound Absorption ◽  
Subjective Evaluation ◽  
Subjective Effects ◽  
Full Scale ◽  
The Other ◽  
Subjective Effect ◽  
Absorption Coefficients ◽  
Subjective Test ◽  
Subjective Experiment ◽  
Room Model

This study aimed to reveal the influence of sound absorption in general dwellings on the subjective evaluation of acoustics. First, a subjective experiment was conducted using a full-scale room model. The results indicate that the feelings of silence and serenity can be experienced at absorption coefficients above 0.17, particularly above 0.25. Additionally, we used the recorded binaural sounds for a subjective test instead of using a full-scale room model. This trial showed that the reverberance, feeling of silence, and feeling of serenity can also be evaluated using a headphone listening test. We also measured the reverberation times and recorded the sound environments in three bedrooms, three living and dining (LD) rooms, and three child rooms in modern Japanese dwellings. The average absorption coefficients of the LD and child rooms were lower than 0.17, in the range of 500 Hz to 4 kHz. Therefore, we analyzed the subjective effect of absorption through a psychological test using binaural recorded sounds. The bedrooms with absorption coefficients of 0.18–0.23 were significantly less reverberant, quieter, and more serene than the other rooms.

Best lighting for jeans, part 1: Optimising colour preference and colour discrimination with multiple correlated colour temperatures

2018 ◽  
Vol 51 (8) ◽  
pp. 1208-1223 ◽  
Author(s):  
Z Huang ◽  
Q Liu ◽  
Y Liu ◽  
MR Pointer ◽  
MR Luo ◽  
...  
Keyword(s):  
Colour Vision ◽  
Lighting Design ◽  
Colour Discrimination ◽  
Shopping Malls ◽  
Colour Preference ◽  
Colour Temperature ◽  
Normal Colour ◽  
Colour Rendering ◽  
Blue Jeans ◽  
Colour Gradient

In this study, two psychophysical experiments, one on colour preference and the other on colour discrimination, were conducted. To investigate the colour preference for blue jeans, 27 subjects with normal colour vision were asked to rate their visual appreciation of seven pairs of jeans with a colour gradient pattern. Nine LEDs, with uniformly sampled correlated colour temperature (CCT) values ranging from 2500 K to 6500 K, were used to illuminate the jeans. These lights produced a constant illuminance of approximately 200 lux, and their colour rendering indexes were between 79 and 91. In addition, using a Farnsworth-Munsell (FM)-100 Hue Test, the blue-region colour discrimination of 42 observers was assessed for five LEDs of the same type but with different CCTs (2500 K–6500 K, 1000 K interval). The results indicate that there is an optimum CCT of 5500 K for jeans, at which observers were found to exhibit the greatest capability for colour discrimination and the highest rating for colour preference. Interestingly, a significant gender difference was found in this study, which had not been observed in our previous work with quite similar experimental settings but different experimental objects. The findings of this study should provide a deeper understanding for the lighting design of shopping malls for jeans.

Colour preference, naturalness, vividness and colour quality metrics, Part 5: A colour preference experiment at 2000 lx in a real room

2017 ◽  
Vol 51 (2) ◽  
pp. 262-279 ◽  
Author(s):  
TQ Khanh ◽  
P Bodrogi ◽  
X Guo ◽  
QT Vinh ◽  
S Fischer
Keyword(s):  
Quality Metrics ◽  
Saturation Level ◽  
Colour Preference ◽  
Colour Temperature ◽  
Led Light ◽  
Preference Ratings ◽  
Light Engine ◽  
Preference Experiment

Subjects rated the colour preference of a colourful object scene illuminated to 2000 lx by 28 different spectra from a four-channel LED light engine at different object saturation levels and different white points (3200 K, 4200 K, 5000 K and 5600 K). Mean colour preference ratings had a maximum at a moderate saturation level. The lowest correlated colour temperature (3200 K) exhibited lower preference ratings than the three higher correlated colour temperatures. The influence of saturation level was modelled by existing colour rendition measures and by the measure colour quality combining a colour fidelity index and an overall object colour object saturation measure taken from Part 4 of this work.

Towards a user preference model for interior lighting. Part 2: Experimental results and modelling

2018 ◽  
Vol 51 (7) ◽  
pp. 1030-1043 ◽  
Author(s):  
TQ Khanh ◽  
P Bodrogi ◽  
X Guo ◽  
PQ Anh
Keyword(s):  
Experimental Method ◽  
Light Source ◽  
Experimental Results ◽  
User Preference ◽  
Colour Preference ◽  
Preference Model ◽  
Colour Temperature ◽  
Visual Attributes ◽  
Interior Lighting

Subjects assessed their visual impressions about scene brightness, visual clarity, colour preference and scene preference in a real room in which the horizontal illuminance, the correlated colour temperature and the level of chroma enhancement of the light source were changed systematically. The aim of the experiment is to contribute to the development of a user preference model. The concept of this model and the experimental method were described in Part 1 of this work. In Part 2, modelling equations of these four visual attributes and their validation are shown. Criterion illuminance levels for ‘good’ levels of the visual attributes were determined depending on correlated colour temperature.

Gender Difference in Colour Preference of Lighting: A Pilot Study

2020 ◽  
pp. 111-122
Author(s):  
Zheng Huang ◽  
Qiang Liu ◽  
Ying Liu ◽  
Michael R. Pointer ◽  
Peter Bodrogi ◽  
...  
Keyword(s):  
Pilot Study ◽  
Gender Difference ◽  
Subjective Ratings ◽  
Colour Preference ◽  
Colour Temperature ◽  
Research Fields ◽  
Significant Difference ◽  
Males And Females ◽  
Preference Ratings ◽  
Visual Colour

Gender difference has been widely reported in many research fields. However, in the topic of colour preference of lighting, such an issue has not aroused much attention. In this study, therefore, three groups of visual experiments with different illuminance (E) levels (50 lx, 200 lx, 600 lx) were conducted which investigated the preferred correlated colour temperature (CCT: 3500 K, 5000 K, 6500 K) for six single-coloured decorative artificial bird-shaped objects (red, green, yellow, blue, white and black). Twenty subjects, ten males and ten females, were invited to respond with their visual colour preference of the experimental objects. The aim of this work was to investigate if gender difference exists when the observers judge objects with different colours under different E-CCT conditions. The results indicate that there is significant difference between males and females for the 200 lx and 600 lx conditions, especially for the cases with higher CCTs (5000 K and 6500 K). In addition, it was found that under certain E-CCT conditions the preference ratings of males and females for certain colours were obviously different. Similarly, for some scenarios the subjective ratings from observers of the same gender also varied with object colour.

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