Image color modification in a computer-aided design system

Details Image color modification in a computer-aided design system Image color modification in a computer-aided design system

1991-08-16

1993-06-22

Nguyen, Phu K.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

395129, 340703, 340747, G06F 3153

Patent

active

052222063

ABSTRACT:
A method and system for alternatingly applying different colors to a realistic computer generated graphic image while preserving the effects of shading, highlights, reflectors and other lighting effects. A user selects a "New Color" to apply to an image and picks an "Original Color" from the image in an area not subject to extreme lighting effects. The difference between the parameters of these two colors in (H,S,V) coordinates is determined and applied to every pixel in a segment of the image to calculate a replacement pixel color. Tools are provided to allow the user to divide an image into segments to which color modification can be individually applied.

REFERENCES:
patent: 3693168 (1972-09-01), Halkyard et al.
patent: 4817172 (1989-03-01), Cho
patent: 4835526 (1989-05-01), Ishii et al.
patent: 4878181 (1989-10-01), McKenna et al.
patent: 4935879 (1990-06-01), Ueda
Commonly-Assigned Copending U.S. patent application No. 359,118, filed May 31, 1989 by Ho-Long Liao & Edward Falk for Image Color Correction System & Method.
Foley, J. D., Van Dam, A. "Fundamentals of Interactive Computer Graphics" (pp. 611-616, Addison-Wesley, 1982).
"Tint Fill", Reprinted from Siggraph--1979, by Alvy Ray Smith, Computer Graphics Lab (pp. 276-283).

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