Division 8: Image Technology

TC8-04: Adaptation under Mixed Illumination Conditions

Progress Report No.2 (1999/Jun.)

by Naoya Katoh @ Sony Corporation, Japan - TC Chair

Two new members* joined our TC; Elibabeth Pirotta from USA, and Elie Khoury from France. We now have eight members; four from Europe, three from USA, and one from Japan.

• Dr. Janos Schanda from University of Veszprem, Hungary
• Dr. Paula J. Alessi (CIE TC1-27 Chair) from Eastman Kodak Company, USA
• Dr. Klara Wenzel from Technical Univ. of Budapest, (also of Coloryte), Hungary
• Ms. Monica Billger from Chalmers Univ. of Tech., Sweden
• Dr. Peyma Oskoui from HP Labs., USA
• *Elizabeth Pirrotta, Consultant, USA
• *Elie Khoury, Alwan Color Expertise, France
• Naoya Katoh from Sony Corporation, Japan - TC8-04 Chair

TC chair had sent Katoh's recent paper "Effect of ambient light on the color appearance of softcopy images: Mixed chromatic adaptation for self-luminous displays" on J. Electronic Imaging, Vol. 7, No. 4, pp794-806 (Oct. 1998), to every TC members. He also provided very Preliminary Draft for Experimental guideline as below, based on Katoh's paper.

http://www.colour.org/tc8-04/Experiment_guideline.html

Also, Preliminary Draft for past research survey was provided at URL below;

http://www.colour.org/tc8-04/Past_survey.html

However, no comments regarding how TC members are going to perform cross-lab experiments has been received so far. TC chair plans to provide a "questionnaire" to survey what information is necessary to perform experiments at their lab. According to the answer to the "questionnaire", TC chair will try to update and fill out more information if needed. TC chair hopes every TC members to start the experiments by the end of this year (1999). Dr. Oskouli and Ms. Pirotta will perform Achromatic Color Matching experimets using uniform color patches (not pictorial images), at fixed (to CRT) state of chromatic adaptation.

Basic idea for Pictorial Image Matching (softcopy vs. hardcopy) is written in Katoh's paper as S-LMS. Possible improvements could be achieved by;

• Applying different chromatic adaptation transformation methods; (Hunt-Pointer-Esteves, Bradford, or others; as in Section 3.2)
• Applying different "incomplete adaptation" methods; (as in Section 3.3.1),
• Applying different for "mixed adaptation" methods; (as in Section 3.3.2)
• Verifying mixed adaptation by using various kinds of images (natural images, CG images, uniform patches, etc).