Color digital front end decomposer output to multiple color spaces with actual output optionally being determined by input color spaces

• US 6,584,903 B2
• Filed: 12/12/2000
• Issued: 07/01/2003
• Est. Priority Date: 12/12/2000
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Jacobs, William S.
• Primary Examiner(s): Nolan, Jr., Charles H.
• Application Number:
  US09/737,217
• Publication Number:
  US 20020069778A1
• Time in Patent Office: 931 Days
• Field of Search: 101/484, 400/76, 400/70, 400/61, 358/1.9
• US Class Current: 101/484
• CPC Class Codes: G06K 15/00 Arrangements for producing a permanent visual presentation of the output data , e.g. computer output printersprinting or plotting combined with another operation, e.g. with conveying, G06K17/00
• CPC Class Codes: G06K 15/1822 Analysing the received data before processing
• CPC Class Codes: G06K 2215/0011 characterised by a particular command or data flow, e.g. Page Description Language, configuration commands

Abstract

A print controller which produces a device specific raster for its printer and also produces a rasterized output in portable and more editable form for export and re-use as an input by other printers which may have different parameters. If the input is in a device independent color space, the rasterized export also will be in a version in a device independent color space, typically CIELAB. If the input is in a printable device dependent color space such as CYMK, the output will be an more editable rasterized version in the same color space, with any printing hints that were in the original will be included in the output. In any case, an override can be provided to change the default selection to any other user-identified version. An example of a device independent color space is CIELAB, of a device dependent version applicable for a number of printers with similar parameters is SWOP CMYK, and of a device dependent version is a printer specific CMYK.

Claims

1. In a printer process which uses a raster image process for transforming a page description language input comprising an input image into a device specific raster for printing, a process for producing a second output which can be used as an input to another printer, comprising:

if the input image is in a device independent color space with rendering hints, RIPping the image to a device independent color space output with rendering hints, or

if the input image is in a device specific color space, RIPping the image to an output of the same color space.

2. The process of claim 1 wherein the device specific color space is appropriate to a number of different kinds of printers that have a similarity in one or more parameters.

3. The process of claim 1 wherein the process is adapted to be changed to produce a second output in any color space.

4. The process of claim 1 wherein two images in different color spaces on the same input page are converted to a second output in one color space.

5. The process of claim 1 wherein the second output device specific color space is CMYK.

6. The process of claim 1 wherein the device independent color space is a three color space.

7. The process of claim 1 wherein the device independent color space is CIELAB.