Abstract
In this thesis, a paradigm was generated for color gamut mapping of pictorial images. This involved the development and testing of: 1.) a hue-corrected version of the CIELAB color space, 2.) an image-dependent sigmoidal-lightness-rescaling process, 3.) an image-gamut- based chromatic-compression process, and 4.) a gamut-expansion process. This gamut-mapping paradigm was tested against some gamut-mapping strategies published in the literature. Reproductions generated by gamut mapping in a hue-corrected CIELAB color space more accurately preserved the perceived hue of the original scenes compared to reproductions generated using the CIELAB color space. The results of three gamut-mapping experiments showed that the contrast-preserving nature of the sigmoidal-lightness-remapping strategy generated gamut-mapped reproductions that were better matches to the originals than reproductions generated using linear-lightness-compression functions. In addition, chromatic-scaling functions that compressed colors at a higher rate near the gamut surface and less near the achromatic axis produced better matches to the originals than algorithms that performed linear chroma compression throughout color space. A constrained gamut-expansion process, similar to the inverse of the best gamut-compression process found in this experiment, produced reproductions preferred over an expansion process utilizing unconstrained linear expansion.
Library of Congress Subject Headings
Color computer graphics; Color printing--Digital techniques; Image processing--Digital techniques
Publication Date
10-1-1999
Document Type
Dissertation
Student Type
Graduate
Department, Program, or Center
Chester F. Carlson Center for Imaging Science (COS)
Advisor
Fairchild, Mark
Advisor/Committee Member
Berns, Roy
Advisor/Committee Member
Balasubramanian, Raja
Recommended Citation
Braun, Gustav J., "A Paradigm for color gamut mapping of pictorial images" (1999). Thesis. Rochester Institute of Technology. Accessed from
https://repository.rit.edu/theses/2860
Campus
RIT – Main Campus
Comments
Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: T385 .B72 1999