Research projects
 

Colour difference The aims of this project are to: evaluate the use of CIE94 and CIEDE2000 as general colour-difference formulas in graphic arts colour reproduction, and to derive optimum acceptability parameters for their use  explore the effects of measurement geometry across different media, quantify the effects of media surface properties such as gloss, and develop correction models for them. Publications: Johnson, A. J. and Green, P. J.The CIEDE2000 colour difference formula and its performance with a graphic arts data set TAGA Journal 2 59-71, 2005 Green, P. J. and Johnson, A. J.The CIEDE2000 colour difference formula and its performance with a graphic arts data set IARIGAI conference, Montreal, Canada, 2001 Green, P. J. and Johnson, A. J.Issues of Measurement and Assessment in Hard Copy Colour Reproduction SPIE Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts, San Jose, CA, 2000 Johnson, A. J. and Green, P. J.Issues of Colour Measurement and Assessment TAGA Conf, 1999

Gamut mapping in colour management systems This project aims to: Derive methods of mapping colours between different media from an empirical study of high quality colour reproductions Implement and test these methods in a colour reproduction system. Publications: Green, P. J.How scaleable are gamut mapping algorithms? SPIE Electronic Imaging conference, San Jose, CA, January 2004 J. Morovic, G. Braun, G. Ebner, P. J. Green, P Herzog, A.J. Johnson, and T, NewmanGuidelines for the Evaluation of Gamut Mapping Algorithms CIE Technical Report 2004 Green, P. J. and Luo, M. R. Developing the CARISMA gamut mapping model J. Imaging Science and Technology 46 1 2002 Green, P. J. and Luo, M. R. A new gamut mapping algorithm for newsprint IARIGAI conference, Montreal, Canada September 2001 Green, P. J. and Luo, M. R.Performance of an extended CARISMA gamut mapping model SPIE Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts, San Jose, CA, 2001 Green, P. J.A test target for defining media gamut boundaries SPIE Color Imaging: Device-Independent Color, Color Hardcopy, and Graphic Arts, San Jose, CA, 2001 Green, P. J. and Luo, M. R.Extending the CARISMA gamut mapping model Colour Image Science 2000, Derby, UK Green, P. J. The effect of gamut compression on tonal reproduction Colour Imaging in Multimedia, Derby, UK, 1998

Colour appearance in colour management systems This project aims to: Explore the effect of surround and background on colour appearance Determine the requirements for visually achromatic colours on a range of different coloured backgrounds Study the visual adaptation to chromatic backgrounds and evaluate methods of reproducing colours on coloured paper Publications: Green, P. J. and Luo, M. R. Surround - the new background? IS&T Conference on Colour in Graphics, Image and Vision, Aachen, 2004 Green, P. J. and Oicherman, B. Reproduction of coloured images on substrates with varying chromaticity SPIE Electronic Imaging conference, San Jose, January 2004 Green, P. J. and Luo, M. R. Modifying colour appearance models for graphic arts viewing conditions SPIE Electronic Imaging conference, Santa Clara, January 2003 Green, P. J. and Otahalova, L. Determining visually achromatic colours on substrates of varying chromaticity SPIE Electronic Imaging conference, Santa Clara, January 2003

Colour image quality This project aims to: Develop and evaluate psychophysical methods appropriate to large sample sets Publications: Lindberg, S. and Green, P. J. Methods of quality assessment for large sample sets J. Imaging Science and Technology 49 4 2005 Green, P. J. and Lindberg, S.Methods of assessment for large sample sets IS&T Conference on Colour in Graphics, Image and Vision, Aachen, 2004

Reference CMYK profiles for commercial offset printing A set of ICC colour profiles have been produced from reference printing measurement data produced by IFRA and FOGRA. The profiles have good colorimetric accuracy and their perceptual rendering intent has been modified to ensure that reproductions meet the objectives of skilled image creators. Publications: Green, P. J. (2002) A set of reference ICC profiles for commercial offset reproduction

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