Terry Wayne Wells

US Patent:

6798920, Sep 28, 2004

Filed:

Mar 29, 2000

Appl. No.:

09/538597

Inventors:

Terry C. Wells - Long Beach CA
Jon S. McElvain - El Segundo CA
David E. Rumph - Pasadena CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

H04N 1409

US Classification:

382275, 358 19, 358 326, 358 327

Abstract:

A method for correcting a white line artifact between low and high frequency printed pixels. A printer may be able to print either a high or low frequency halftone pixels in some locations, but may be able to print only high frequency halftone pixels in other locations, the latter known as out of phase locations. If the image data is in run length encoded form, and the printer tries to print a low frequency pixel in an out of phase location, no pixel will be printed in that location and a white space results. The remedy is to test at the beginning and end of low frequency runs bordering high frequency runs. If the first (last) low frequency pixel of an original run is in an out of phase location, a one pixel run of the high frequency screen and of the low frequency color is added before (after) the original run, and the run length of the low frequency run is decreased by one pixel.

US Patent:

7538917, May 26, 2009

Filed:

Jul 8, 2005

Appl. No.:

11/178129

Inventors:

Thomas C. Rich - El Segundo CA, US
David E. Rumph - Pasadena CA, US
Terry C. Wells - Long Beach CA, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

G03F 3/08

US Classification:

358518, 382167, 358 19, 358 21, 358444

Abstract:

A computer-implemented method of matching color elements for objects having different source color definitions within a print job prior to printing, includes identifying all source colors to be printed within the print job and object type associated with each instance of a source color; identifying any source colors having at least two different source color definitions; for each source color having at least two different source color definitions, selecting one of the source color definitions in accordance with a predetermined criterion; and assigning the selected source color definition to at least one other instance of the source color for that object type. The predetermined criterion may include for each source color having at least two different source color definitions for the same object type, assigning the selected source color definition to all other instances of the source color for that object type.

US Patent:

7612912, Nov 3, 2009

Filed:

Jul 8, 2005

Appl. No.:

11/178106

Inventors:

David E. Rumph - Pasadena CA, US
Terry C. Wells - Long Beach CA, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

G06F 15/00
G06K 1/00
H04N 1/60

US Classification:

358 19, 358 16

Abstract:

A method of identifying color mismatches for objects having different rendering intents within a print job prior to printing, includes identifying all objects within the print job, each object's type, rendering intent and all source colors associated with it; for each object in the print job, transforming each object's source colors using a prototypical color transformation; identifying sets of transformed objects having source colors that match within a first tolerance; transforming all transformed objects using a target printer's color space; identifying any of the transformed objects in each set that do not match within a second tolerance level; identifying any object types within the group of mismatched objects having at least two different rendering intents; selecting one of the rendering intents in accordance with a predetermined criterion; and assigning the selected rendering intent to at least one other instance of that object type.

US Patent:

8643892, Feb 4, 2014

Filed:

Aug 29, 2005

Appl. No.:

11/214393

Inventors:

William S. Jacobs - Los Angeles CA, US
Michael E. Farrell - Ontario NY, US
John P. Monahan - Los Angeles CA, US
David C. Robinson - Penfield NY, US
David E. Rumph - Pasadena CA, US
Terry C. Wells - Long Beach CA, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

G06F 15/00

US Classification:

358 19, 358530, 358 115, 382165

Abstract:

A method and system for determining chromatic content of a page of an electronic document. Object level color analysis is performed on a page of the electronic document to determine whether the page is chromatic, achromatic or has highlight color, based on the object level color analysis. The page is then classified as chromatic, achromatic or highlight color, based on the results of the determination.

US Patent:

63025221, Oct 16, 2001

Filed:

May 12, 2000

Appl. No.:

9/569638

Inventors:

David E. Rumph - Pasadena CA
Terry C. Wells - Long Beach CA
Susan Evans - California City CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 221

US Classification:

347 43

Abstract:

A method of determining whether a page to be printed on a color printer will actually be entirely printed in one colorant, usually black, and if so, automatically omitting whatever processing steps are unnecessary as a result. Determining if the page is monochrome can be done either by (1) including a signal in the PDL or by a signal from the user or by (2) inspecting each element of the page to determine if all elements are specified to be printed in the same one colorant. If either is true, then various color operations such as trapping, color conversion to any other color, and color correction for non-selected colors can be automatically omitted.