Instructor: Roy Berns, Gray Sky Imaging
Level: Introductory
Duration: 2 hours
Course Date/Time: Monday, June 19 8 AM - 10:00 AM

Benefits:
This course enables the attendee to:

• Understand the relationship between human color vision and CIELAB.
• Understand the origin and derivation of CIELAB.
• Understand how to use CIELAB for defining color differences.
• Understand the limitations of CIELAB for defining color differences.
• Understand the origin and derivation of CIEDE2000 for defining color differences.
• Understand the limitations of CIEDE2000 for defining the color quality of images.

Course Description:
FADGI and ISO standards require calculating the average CIEDE2000 of a test-target image as a measure of color image quality. CIEDE2000 requires colored defined using CIE L*a*b*. The course digs into CIELAB and discusses how it’s modeled on human color vision. The course explains how to calculate hue, lightness, and chroma differences and combine them to calculate a total color difference, “delta-E.” The CIE philosophy of correcting a color space with poor visual uniformity rather than deriving a new color space is discussed. CIEDE2000 is the correction. The course digs into this formula, and breaks it down and traces its roots to the 1970’s. The course concludes by identifying strengths and weaknesses of using an average total color difference as a measure of color image quality.

Intended Audience:
Anyone that uses CIELAB and CIEDE2000 for defining color image quality.

Roy S. Berns is the chief technical officer at Gray Sky Imaging in Rochester, NY. He derived CIE94 and was a member of the CIE technical committee that derived CIEDE2000. Previously, he held the Richard S. Hunter Professor in color science, appearance, and technology at Rochester Institute of Technology, where he developed both MS and PhD programs in color science. He received BS and MS in textiles from the University of California, Davis and a PhD in chemistry from Rensselaer Polytechnic Institute. Berns has received scientific achievement awards from the Inter-Society Color Council, I&T, the Colour Group of Great Britain, and the International Association of Colour.