The Symbolism of Colour in English Language”

Total Page:16

File Type:pdf, Size:1020Kb

The Symbolism of Colour in English Language” THE MINISTRY OF HIGHER AND SECONDARY SPECIALIZED EDUCATION OF THE REPUBLIC OF UZBEKISTAN The uzbek state world languages university II ENGLISH PHILOLOGY FACULTY “ENGLISH APLIED SCIENCES” DEPARTMENT QUALIFICATION PAPER on “The symbolism of colour in English language” Written by the student of the 4 course Group 427 B Abdukarimona N.A ___________________________ Scientific supervisor PhD Atahanova G.Sh. ______________________________ This qualification paper is considered and admitted to defense Protocol №___9_______of ”_27_”___aprel____2011 TASHKENT 2011 Contents Introduction ……………………………………………………………… 3 Chapter I THE MAIN ASPECTS OF COLOR 1.1 Development of theories of color……………………………..……….6 1.2 Color naming and associations……………………………...……..…10 1.3 Color term ………………………………………………..…….…..…12 Chapter II THE ANALYSIS OF COLOR TERMS 2.1 Semantics of Symbol …………………………………………....……..18 2.2 Structural Features of Symbol…………………………….……..…….22 2.3 Comparative Analysis of Semantics and main tropes – metaphor and metonymy………………………………………………………….…..27 2.4 Semantic and Stylistic Analysis of Color Terms…………………..…51 Conclusion ……………………………………………………………….…63 Bibliography ……………………………………………………………..…65 INTRODUCTION It is probably useless to prove that vocabulary is an important part of language and hence its importance for any student of English Our work deals with words and expressions denominating colours, therefore the term colour words is used. Due to their nature knowledge of such words and some stores to look for them are essential for advertising, art students and other. Nowadays more and more people get access to different types of texts written in English. Understanding of fiction of different types, advertisements, names of food-stuffs and other goods, appearing both in typographic print and in the Internet become a professional and everyday need of more and more people. While reading a text in English readers face a certain number of problems. One of such problems is to understand and to translation/interpret colour words. To interpret here means not only to translate orally, but to reveal the underlying meaning. Colour words are freely used by the authors to describe different things, such as features of the characters faces, clothes, jewellery, make-up, cars, landscapes and seascape, pieces of art etc. Look at the sky in Blue Eys by T.Hardy: the sky gray of the purest melancholy; a lemon- hued expanse of western sky; the pale glow of the sky; it was a familiar September sunset, dark-blue fragments of cloud upon an orange-yellow sky; a violet sky; rich indigo hue of a midnight sky; a rosy sky; in a sky of ashen hue. In eager wish to express their thoughts and ideas most precisely, authors hunt for more suitable and most unusual words. W. Somerset Maugham in Theatre describing Julias bedroom uses Nattier blue, the colour that connects Julia with the world of arts and artists, hints at her French origin and reveals her bright vivid nature. Oscar Wilde in Portrait of Dorian Gray wishing to express the brightness of the June day and of Dorians beauty, uses rose, pink, vermilion, purple, lilac, yellow, green and coal-black. He paints the portraits of his characters with ivory, scarlet, rose-red, rose-white, white and olive; he finds pink and scarlet on their lips, and blue, black, amethyst in their eyes. Sometimes colour words become main characteristics of a famous character, we find such characters in Grimms Fairy Tales: Little Red Riding-Hood, Bluebeard, Snow White and the Seven Dwarfs, Goldilocks and the Three Bears. And the Fairy with blue hair proves it. Colours are widely used to describe clothes. J.K.Rowling clothes her superficial character Gilderoy Lockhart in robes in forget-me-not-blue, aquamarine, turquoise, deep, plum, jade-green, lilac and midnight blue, demonstrating his love for outstanding looks. Her characters also wear green, purple and black robes. To give more examples of such words in clothes, lets recall of Robin Hood and his merry men, clad in Lincoln green, Black Cloak and Little Red Riding Hood. Colour and words of colour became the moving power of stories. In Rouge we learn about a servant, whose deadly paleness so much disturbed her mistress, that the latter ordered the poor maid put some rouge on her cheeks. The colour words used to subscribe the shades of skin and complexion are really diverse. Characters blush, grow red, go scarlet and pink, glow and even get black eyes! A yellow face was not only the title but also the starter of a story by A.C.Doyle. The descriptions of pieces of art require accuracy as well as poetical way of thinking. Such descriptions are generously used by different authors Maugham (The Moon and the Sixpence), Wilde (Picture of Dorian Gray), Priestly (Jenny Willers) and many more. The actuality of the qualification paper is determined by increased interest of linguistic in studying the origin of words of colour. Still much is left to investigate. The purpose of the qualification paper is determine the words of colour in English language. The tasks of the investigation include: • to study color naming and associations. • to find out semantics of symbol and structural features of symbol • to investigate semantic and stylistic analysis of Color Terms. The novelty of this work consists in revealing essence, in the description and detailed, complex analysis of Color Terms in the English language. In this work we attempt to give out and classify the linguistic aspects of Color Terms. The problem under consideration in the qualification paper possesses definite theoretical value, for, fist of all, it is based on the principles of approach, which is revealed on all the stage of investigation. The results of the investigation present interest for a number of fields of contemporary linguistics: linguistic typology, theory of translation, stylistics, lexicology, theoretical grammar, lexicography. Practical significance of the results of investigation consists in the fact they can be used in: 1. in teaching English for Uzbek and Russian students. 2. in compiling practical courses of English. 3. in compiling bilingual dictionaries. 4. in writing lectures on lexicology, stylistics and theory of translation. Investigations have been carried out on a vast language material, based on lexicographic sources. We used mainly monolingual, bilingual and encyclopedic dictionaries. The structure of the qualification paper. It includes introduction, chapters, conclusion, list of used literature. Chapter I is dedicated to the study of theories of color, color naming and associations , color term In the 2 nd Chapter semantics of symbol, structural features of symbol, comparative analysis of semantics and main tropes – metaphor and metonymy, semantic and stylistic analysis of Color Terms has been discussed. CHAPTER 1 THE MAIN ASPECTS OF COLOR 1.1 Development of theories of color Color or colour is the visual perceptual property corresponding in humans to the categories called red, green, blue and others 1. Color derives from the spectrum of light (distribution of light energy versus wavelength ) interacting in the eye with the spectral sensitivities of the light receptors . Color categories and physical specifications of color are also associated with objects, materials, light sources, etc., based on their physical properties such as light absorption, reflection, or emission spectra. By defining a color space , colors can be identified numerically by their coordinates. Because perception of color stems from the varying spectral sensitivity of different types of cone cells in the retina to different parts of the spectrum, colors may be defined and quantified by the degree to which they stimulate these cells. These physical or physiological quantifications of color, however, do not fully explain the psychophysical perception of color appearance. The science of color is sometimes called chromatics. It includes the perception of color by the human eye and brain, the origin of color in materials, color theory in art , and the physics of electromagnetic radiation in the visible range (that is, what we commonly refer to simply as light ). Spectral colors The familiar colors of the rainbow in the spectrum – named using the Latin word for appearance or apparition by Isaac Newton in 1671 – include all those colors that can be produced by visible light of a single wavelength only, the pure spectral or monochromatic colors . The table at right shows approximate frequencies (in terahertz ) and wavelengths (in nanometers ) for various pure spectral colors. The wavelengths are measured in air or vacuum (see refraction ). The color table should not be interpreted as a definitive list – the pure spectral colors form a continuous spectrum , and how it is divided into distinct colors 1 Berlin, Brent; Kay, Paul; Merrifield, William R. The world colour survey. Dallas: Academic Publications of the Summer Institute of Linguistics. - 1991. linguistically is a matter of culture and historical contingency (although people everywhere have been shown to perceive colors in the same way). A common list identifies six main bands: red, orange, yellow, green, blue, and violet. Newton's conception included a seventh color, indigo , between blue and violet. Optical scientists Hardy and Perrin list indigo as between 446 and 464 nm wavelength. The intensity of a spectral color, relative to the context in which it is viewed, may alter its perception considerably; for example, a low-intensity orange-yellow is brown , and a low-intensity yellow-green is olive-green. Although Aristotle and other ancient scientists had already written on the nature of light and color vision , it was not until Newton that light was identified as the source of the color sensation. In 1810, Goethe published his comprehensive Theory of Colors . In 1801 Thomas Young proposed his trichromatic theory , based on the observation that any color could be matched with a combination of three lights. This theory was later refined by James Clerk Maxwell and Hermann von Helmholtz . As Helmholtz puts it, "the principles of Newton's law of mixture were experimentally confirmed by Maxwell in 1856.
Recommended publications
  • Preferred Illuminance and Color Temperature Combination
    Oi, Preferred Illuminance and Color Temperature Combination PREFERRED COMBINATIONS BETWEEN ILLUMINANCE AND COLOR TEMPERATURE IN SEVERAL SETTINGS FOR DAILY LIVING ACTIVITIES Naoyuki Oi, Hironobu Takahashi Kyushu University ABSTRACT Illuminance and color temperature are widely recognized as important factors in interior lighting. Luminance and preferred color temperature are known to be related each other, since Kruithof showed the comfortable illuminance zone related to the color temperature of light sources. However, recent research papers showed the Kruithof's curve is not always useful. It seems to be because Kruithof does not consider the influence of activities to the preference of lighting condition. This paper shows the result of subjective evaluation of scale models on preferred combinations between luminance and color temperature in six settings of living activities at home. For the experiment, 1:10 scale models illuminated with the light source consists of red, green, and blue compact fluorescent tubes with controllers were used. Lighting conditions used are the combination of illuminance (50, 100, 200, 400, 800lux) and color temperature (3000, 4200, 5000, 6500K). Interior color is white, with a small color patch on the wall. Six settings of Living activities are the space for "relaxing", "family gathering", "dining", "cooking", "studying", and "retiring (bedroom before sleep)". Three variables: "preference", "brightness", and "naturalness of color appearance" are evaluated. In the space for relaxing, low color temperature and relatively low illuminance are preferred. In the space for family gathering, preferred conditions are similar to the Kruithof's comfortable zone except high illuminance over 200lux. These results are generally similar to Nakamura's result. In the space for dining, preferred conditions are similar to the Kruithof's comfortable zone.
    [Show full text]
  • Standard Colour Spaces
    Artists House t: +44 (0)20 7292 0400 14-15 Manette St f: +44 (0)20 7292 0401 London, W1D 4AP www.filmlight.ltd.uk UNITED KINGDOM Technical Note Standard Colour Spaces Richard Kirk Document ref. FL-TL-TN-0417-StdColourSpaces Creation date January 9, 2004 Last modified 30 November 2010 Version no. 4.0 Summary In 1931, the Commission Internationale d'Éclairiage (CIE) recommended a system for colour measurement. This system allowed the specification of colour matches using the CIX XYZ tristimulus values. In 1976, the CIE recommended the CIE LAB and CIE LUV colour spaces for the measurement of colour differences, and colour tolerances. These colour spaces, and their more modern variants are the basic tools for modern colorimetry. You can use Truelight without knowing all about CIE colour spaces. However, if you wonder why the XYZ and the L*a*b* calibration for the same monitor look different, you may find your explanation here. Whites are dealt with in a separate section. Most of us know what white paper and white paint is. We might think we know what white light is too. A full discussion of what is and what is not 'white' is much too big a task for this small note, but we introduce a few basic issues. Scanners and printers usually communicate in their own device-dependent RGB. Video has its own colour standard. Densitometers use Status A and Status M colour spaces. We describe all the spaces that Truelight uses to build up a colour transform. Finally we describe a number of effects that are not covered by the standard colour models.
    [Show full text]
  • Preferred Colour Temperatures of Ambient Light at Different Light Level Settings
    PO128 PREFERRED COLOUR TEMPERATURES OF AMBIENT LIGHT AT DIFFERENT LIGHT LEVEL SETTINGS Tommy Goven et al. DOI 10.25039/x46.2019.PO128 from CIE x046:2019 Proceedings of the 29th CIE SESSION Washington D.C., USA, June 14 – 22, 2019 (DOI 10.25039/x46.2019) The paper has been presented at the 29th CIE Session, Washington D.C., USA, June 14-22, 2019. It has not been peer-reviewed by CIE. CIE 2019 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from CIE Central Bureau at the address below. Any mention of organizations or products does not imply endorsement by the CIE. This paper is made available open access for individual use. However, in all other cases all rights are reserved unless explicit permission is sought from and given by the CIE. CIE Central Bureau Babenbergerstrasse 9 A-1010 Vienna Austria Tel.: +43 1 714 3187 e-mail: [email protected] www.cie.co.at Govén, T., Laike, T. PREFERRED COLOUR TEMPERATURES OF AMBIENT LIGHT AT DIFFERENT LIGHT … PREFERRED COLOUR TEMPERATURES OF AMBIENT LIGHT AT DIFFERENT LIGHT LEVEL SETTINGS Tommy Govén1, Thorbjörn Laike2 1 Svensk Ljusfakta, Stockholm, SWEDEN, 2 Lund University, Lund, SWEDEN [email protected], [email protected] DOI 10.25039/x46.2019.PO128 Abstract Ambient light is taken more into account in today’s lighting design as it has a major impact on human well-being as well as reduction of glare.
    [Show full text]
  • Chapter 2 Incandescent Light Bulb
    Lamp Contents 1 Lamp (electrical component) 1 1.1 Types ................................................. 1 1.2 Uses other than illumination ...................................... 2 1.3 Lamp circuit symbols ......................................... 2 1.4 See also ................................................ 2 1.5 References ............................................... 2 2 Incandescent light bulb 3 2.1 History ................................................. 3 2.1.1 Early pre-commercial research ................................ 4 2.1.2 Commercialization ...................................... 5 2.2 Tungsten bulbs ............................................. 6 2.3 Efficacy, efficiency, and environmental impact ............................ 8 2.3.1 Cost of lighting ........................................ 9 2.3.2 Measures to ban use ...................................... 9 2.3.3 Efforts to improve efficiency ................................. 9 2.4 Construction .............................................. 10 2.4.1 Gas fill ............................................ 10 2.5 Manufacturing ............................................. 11 2.6 Filament ................................................ 12 2.6.1 Coiled coil filament ...................................... 12 2.6.2 Reducing filament evaporation ................................ 12 2.6.3 Bulb blackening ........................................ 13 2.6.4 Halogen lamps ........................................ 13 2.6.5 Incandescent arc lamps .................................... 14 2.7 Electrical
    [Show full text]
  • A World of Services for Passengers Improvement of Lighting Ambience
    Challenge D: A world of services for passengers Improvement of lighting ambience on board trains: experimental results on the combined effect of light parameters and seat colours on perception C. Talotte*, S. Ségrétain*, J. Gonac’h¤, J. Le Rohellec# *SNCF Innovative and Research Department, Paris, France ¤CNRS LCPE/LAM Laboratory, Paris, France #CNRS MNHN Laboratory, Paris, France Summary For the time being, lighting specifications for train interiors include only functional parameters of illuminance (level and uniformity) and standards are more oriented on security than on comfort target. Since three years now, SNCF has developed a research program on visual comfort in order to better understand customer's perception and expectations about lighting ambience and improve specifications for new trains and refurbishing for existing ones. The paper presents experimental results on the combined effect of light parameters and seat colours on passengers’ perception. The results confirmed thus obtained from commercial inquiries concerning the illuminance levels which are perceived as too high. Our results show that if a level <150 Lux is proposed, the lighting ambience is perceived as relaxing and soft while it is perceived as glaring, aggressive and tiring if the illuminance is >200 Lux which is usually the case in actual train interiors. 1. Introduction For the time being, lighting specifications for train interiors include only functional parameters of illuminance (level and uniformity) and standards are more oriented on security than on comfort target. The EN 13272 standard [EN 13 272, 2002] suggests to fix the illuminance in train coaches at least at 150 Lux. No maximum thresholds are proposed and some train configurations can reach in actual practice 200 Lux as 400 Lux without any specification.
    [Show full text]
  • Book IX Composition
    D DD DD Composition DDDDon.com DDDD Basic Photography in 180 Days Book IX - Composition Editor: Ramon F. aeroramon.com Contents 1 Day 1 1 1.1 Composition (visual arts) ....................................... 1 1.1.1 Elements of design ...................................... 1 1.1.2 Principles of organization ................................... 3 1.1.3 Compositional techniques ................................... 4 1.1.4 Example ............................................ 8 1.1.5 See also ............................................ 9 1.1.6 References .......................................... 9 1.1.7 Further reading ........................................ 9 1.1.8 External links ......................................... 9 1.2 Elements of art ............................................ 9 1.2.1 Form ............................................. 10 1.2.2 Line ............................................. 10 1.2.3 Color ............................................. 10 1.2.4 Space ............................................. 10 1.2.5 Texture ............................................ 10 1.2.6 See also ............................................ 10 1.2.7 References .......................................... 10 1.2.8 External links ......................................... 11 2 Day 2 12 2.1 Visual design elements and principles ................................. 12 2.1.1 Design elements ........................................ 12 2.1.2 Principles of design ...................................... 15 2.1.3 See also ...........................................
    [Show full text]
  • Book III Color
    D DD DDD DDDDon.com DDDD Basic Photography in 180 Days Book III - Color Editor: Ramon F. aeroramon.com Contents 1 Day 1 1 1.1 Theory of Colours ........................................... 1 1.1.1 Historical background .................................... 1 1.1.2 Goethe’s theory ........................................ 2 1.1.3 Goethe’s colour wheel .................................... 6 1.1.4 Newton and Goethe ..................................... 9 1.1.5 History and influence ..................................... 10 1.1.6 Quotations .......................................... 13 1.1.7 See also ............................................ 13 1.1.8 Notes and references ..................................... 13 1.1.9 Bibliography ......................................... 16 1.1.10 External links ......................................... 16 2 Day 2 18 2.1 Color ................................................. 18 2.1.1 Physics of color ....................................... 20 2.1.2 Perception .......................................... 22 2.1.3 Associations ......................................... 26 2.1.4 Spectral colors and color reproduction ............................ 26 2.1.5 Additive coloring ....................................... 28 2.1.6 Subtractive coloring ..................................... 28 2.1.7 Structural color ........................................ 29 2.1.8 Mentions of color in social media .............................. 30 2.1.9 Additional terms ....................................... 30 2.1.10 See also ...........................................
    [Show full text]
  • Dn Ay Cn Ei Cfi Fe Yg Re N E Tn Em Ev Or P Mi Yti La Uq Ru Ol
    nitmtAdagirein airtel otetrapeD tnemt fo lE tce r laci reenignE gni dna tamotuA noi era ytilauq ruoloc dna ycneicfife ygrenE ycneicfife dna ruoloc ytilauq era - o t l aA nI .gnithgi l ecfifo ni stcepsa tnatropmi stcepsa ni ecfifo l .gnithgi nI DD E ygren ycneicfife dna ecfifo eht thgil ot tnatropmi si ti ,noitidda ti si tnatropmi ot thgil eht ecfifo 602 derreferp ehT . gni thgi l derreferp ht iw moor iw ht derreferp l thgi gni . ehT derreferp / ecfifo na ni snoitidnoc suonimul snoitidnoc ni na ecfifo 6102 c ruolo ytilauq tnemevorpmi no tceffe evitisop a etaerc nac tnemnorivne nac etaerc a evitisop tceffe no a y i n aB j aR k a puR devorpmi ot sdael nrut ni taht rekrow ecfifo rekrow taht ni nrut sdael ot devorpmi laicos dna ,ytivitaerc ,ecnamrofrep krow ,ecnamrofrep ,ytivitaerc dna laicos a dn evitcejbus ecnereferp fo .ruoivaheb . L DE ecfifo gnithgil tnereffid ruof serolpxe siseht sihT siseht serolpxe ruof tnereffid ruoloc dna ycneicfife ygrene rof sehcaorppa rof ygrene ycneicfife dna ruoloc eseh .tneevorp ytilauq u a l i t y i pm r o v eme n t . hT e s e a r e gnithgil ,artceps DEL fo noitazimitpo fo DEL ,artceps gnithgil rm da ietphte-u n tfiorter t gni , taeh-euh sisehtopyh dna trams R kapu jaR ayinaB osla siseht ehT . lortnoc gnithgi l roodni l gnithgi lortnoc . ehT siseht osla DEL fo secnereferp evi tcejbus senimaxe tcejbus evi secnereferp fo DEL setagitsevni ti ,noitidda nI .gnithgil ecfifo .gnithgil nI ,noitidda ti setagitsevni spuorg c inhte eerht fo secnereferp TCC eht TCC secnereferp fo eerht inhte c spuorg E )a A n ,n A ap ruE( naepo , sA
    [Show full text]
  • TAOS Colorimetry Tutorial "The Science of Color" Contributed by Todd Bishop and Glenn Lee February 28, 2006
    TAOS Inc. is now ams AG The technical content of this TAOS document is still valid. Contact information: Headquarters: ams AG Tobelbader Strasse 30 8141 Premstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: [email protected] Please visit our website at www.ams.com Number 20 White Paper TAOS Colorimetry Tutorial "The Science of Color" contributed by Todd Bishop and Glenn Lee February 28, 2006 ABSTRACT The purpose of this paper is to give a brief overview of colorimetry. Colorimetry is the science of measuring color and color appearance. The main focus of colorimetry has been the development of methods for predicting perceptual matches on the basis of physical measurements. This topic is much too broad to be covered by one document, so a general coverage of the subject will be introduced. COLOR AND LIGHT The question of what is color would seem to be an easy one at face value. If a child was asked what color an apple was, they would say red. But what does red really mean? Most people have been asked the riddle, “if a tree falls in the forest and no one is there to hear it, does it make a sound?” The answer is it makes a sound wave, but it is not a sound until a brain interprets the sound wave. The same can be said if the riddle asks, “what color is a tree if no one is there to see it?” A ‘color’ is an interaction between a very small range of electromagnetic waves and the eyes and brain of a person.
    [Show full text]
  • How Smart Leds Lighting Benefit Color Temperature and Luminosity
    energies Article How Smart LEDs Lighting Benefit Color Temperature and Luminosity Transformation Yu-Sheng Huang 1, Wei-Cheng Luo 1, Hsiang-Chen Wang 1, Shih-Wei Feng 2, Chie-Tong Kuo 3 and Chia-Mei Lu 4,* 1 Graduate Institute of Opto-Mechatronics, National Chung Cheng University, 168 University Rd., Min-Hsiung, Chia-Yi 62102, Taiwan; [email protected] (Y.-S.H.); [email protected] (W.-C.L.); [email protected] (H.-C.W.) 2 Department of Applied Physics, National University of Kaohsiung, 700 Kaohsiung University Rd., Nanzih District, Kaohsiung 81148, Taiwan; [email protected] 3 Department of Physics, National Sun Yat-sen University, 70 Lienhai Rd., Kaohsiung 80424, Taiwan; [email protected] 4 Department of Digital Multimedia Design, Cheng Shiu University, 840 Chengcing Rd., Niaosong District, Kaohsiung 83347, Taiwan * Correspondence: [email protected]; Tel.: +886-7-735-8800 (ext. 5508) Academic Editor: Jean-Michel Nunzi Received: 20 February 2017; Accepted: 5 April 2017; Published: 11 April 2017 Abstract: Luminosity and correlated color temperature (CCT) have gradually become two of the most important factors in the evaluation of the performance of light sources. However, although most color performance evaluation metrics are highly correlated with CCT, these metrics often do not account for light sources with different CCTs. This paper proposes the existence of a relationship between luminosity and CCT to remove the effects of CCT and to allow for a fairer judgment of light sources under the current color performance evaluation metrics. This paper utilizes the Hyper-Spectral Imaging (HSI) technique to recreate images of a standard color checker under different luminosities, CCT, and light sources.
    [Show full text]
  • Colour Rendering of Indoor Lighting with CIE Illuminants and White Leds for Normal and Colour Deficient Observers Joa˜O M
    Ophthal. Physiol. Opt. 2010 30: 618–625 Colour rendering of indoor lighting with CIE illuminants and white LEDs for normal and colour deficient observers Joa˜o M. M. Linhares, Paulo E. R. Felgueiras, Paulo D. Pinto and S. M. C. Nascimento Department of Physics, University of Minho, Campus de Gualtar, Braga, 4710-057, Portugal Abstract The goal of this work was to evaluate the colour rendering of indoor lighting with CIE illuminants and white LEDs by estimating the chromatic diversity produced for normal and colour deficient observers. Reflectance spectra of a collection of scenes made of objects typically found indoors were obtained with hyperspectral imaging. Chromatic diversity was computed for 55 CIE illuminants and five LED light sources by estimating the number of different colours perceived in the scenes analysed. A considerable variation in chromatic diversity was found across illuminants, with the best producing about 50% more colours than the worst. For normal observers, the best illuminant was CIE FL3.8 which produced about 8% more colours than CIE illuminant A and D65; for colour deficient observers, the best illuminants varied with the type of deficiency. When the number of colours produced with a specific illuminant was compared against its colour rendering index (CRI) and gamut area index (GAI), weak correlations were obtained. Together, these results suggest that normal and colour deficient observers may benefit from a careful choice of the illuminant, and this choice may not necessarily be based only on the CRI or GAI. Keywords: colour deficiencies, colour gamut, colour rendering, colour vision, illumination Colour Rendering Index (CRI)(CIE, 1995), has, how- Introduction ever, a number of limitations (Xu, 1993; CIE, 1995; van The visual perception of a scene is critically influenced Trigt, 1999) and other quality measures have been by the spectral composition of the illumination (Davis considered (Pointer, 1986; Xu, 1997; Davis and Ohno, and Ginthner, 1990; Fotios, 2001; Scuello et al., 2005; Li, 2008).
    [Show full text]
  • Modeling and Control of Color Tunable Lighting Systems
    Energy and Buildings 68 (2014) 242–253 Contents lists available at ScienceDirect Energy and Buildings j ournal homepage: www.elsevier.com/locate/enbuild Modeling and control of color tunable lighting systems a b,∗ a c Sina Afshari , Sandipan Mishra , Agung Julius , Fernando Lizarralde , d a John D. Wason , John T. Wen a Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, 110, 8th Street, Troy, NY 12180, USA b Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110, 8th Street, Troy, NY 12180, USA c Department of Electrical Engineering, COPPE/UFRJ, P.O. Box 68504, CP 21945/970, Rio de Janeiro, Brazil d Wason Technology, LLC, 740, Hoosick Road, Box 4117, Troy, NY 12180, USA a r t i c l e i n f o a b s t r a c t Article history: Electric lighting has not substantially changed in over 100 years. From incandescent bulbs to fluorescent Received 8 April 2013 tubes, the efficiency remains low and control mostly involves on/off or dimming. The new wave of solid Received in revised form 15 July 2013 state lighting offers the possibility of sensor-based intensity regulation, color control, and energy effi- Accepted 20 August 2013 ciency, under varying needs and environmental conditions. This paper formulates the lighting control problem as an optimization problem balancing color fidelity, human perception and comfort, light field Keywords: uniformity, and energy efficiency. The optimization problem is solved based on the light propagation Smart lighting model, which is adaptively updated with color sensor feedback to account for changing ambient lighting Feedback control conditions, such as daylighting.
    [Show full text]