Patent · US Expired

Method and apparatus for partial electronic retouching of colors

US4393399A · kind A · utility

38Cited by

7References

31Claims

0Family size

Assignee

Dr. Ing. Rudolf Hell GmbH · DE

Inventors

Uwe Gast · Rammsee, DE
Eberhard Hennig · Ascheberg, DE
Dieter Preuss · Garbsen, DE
Heinz Taudt
Klaus Wellendorf

Key dates

Filing date	Jan 8, 1981
Grant date	Jul 12, 1983
Priority date	—
Expiry date	Jan 8, 2001

Classification

Technology area (CPC H)Electricity
CPC primaryH04N1/622
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Apparatus and method for electronically retouching color images reproductions in which the color signals are generated by means of scanning image point by image point and by trichromatic master scanning and then the signals are digitized and the digital color values of the individual color components are stored in a storage medium and the stored color values are then changed by identifying the coordinates of the image points to be changed in the color image and simultaneously determining the coordinate identification and the locally dependent correction values for the digital color values of the color components and then changing the digital color values by applying correction values at the correction locations so as to obtain the retouched color values.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.