Patent Number: 7,715,050

Title: Tonescales for geographically localized digital rendition of people

Abstract: In a method and system for processing a photographic image having lightness values, L*, representing one of the colorimetric values of an original scene, the photographic image is transformed. The transformed image has a gamma as a function of CIE 1976 L*, which includes a dark region having a rising slope, a light region having a falling slope, and a plateau region having a slope constantly within 5 percent of a maximum value in said plateau region. The rising slope is at least twice as large as the absolute value of the falling slope. The plateau region is between 10 L* and 30 L* wide. Gamma is a derivative of visually perceived reproduced CIE 1976 L* versus scene CIE 1976 L*. Gamma has a maximum slope between 1.5 and 2.0.

Inventors: Topfer; Karin (Rochester, NY), Brust; Thomas B. (Webster, NY), Keller; Brent (Rochester, NY), Jin; Elaine W. (Webster, NY)

Assignee: Eastman Kodak Company

International Classification: H04N 1/60 (20060101); H04N 1/407 (20060101)

Expiration Date: 5/11/12018