David C Mcdowell

US Patent:

47944218, Dec 27, 1988

Filed:

Dec 16, 1985

Appl. No.:

6/809550

Inventors:

Michael D. Stoudt - Webster NY
Michael Mosehauer - Rochester NY
Eric K. Zeise - Pittsford NY
Jerome G. Spitzner - late of Rochester NY
David Q. McDowell - Penfield NY
George N. Tsilibes - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G 1501
G03G 1504

US Classification:

355 3R

Abstract:

Apparatus and method for electrophotographically producing high quality reproductions which contain different content types. Photoconductor image sectors are subjected to separate optical exposures selected for (1) good tone-scale reproduction of continuous-tone image portions and (2) high-contrast reproduction of line-type image portions. Photoconductor background area, which border continuous-tone image portions, are discharged to a level below the system's development level. Color line-art from a black and white original is also provided for in a color-copier by exposing a separate original containing a swatch of the color to be reproduced on the same image frames exposed to the image of the line-art. A digitizing tablet is used in combination with a selective erase means to provide selective screening and/or spot color effects. The digitizing tablet may be incorporated to use the exposure platen and may be of the sonic type or other types not employing grid lines visible to the photoconductor.