Method for performing a color space transformation

a color space and transformation technology, applied in the field of image processing systems, can solve the problems of inability to perform color transformation, inability to achieve color transformation, loss of color information produced by “black generation” during the creation of cmyk images, etc., and achieve the effect of facilitating the optimization of the color transformation process

Inactive Publication Date: 2010-08-17
INTELLECTUAL VENTURES I LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The method accurately transforms RGB to CMYK, maintaining high accuracy in black generation, with errors typically around one or two percent, and can handle images with different black-generation strategies by averaging them.

Problems solved by technology

One problem with such a transformation is that a CMYK color space is a four-dimensional space and an RGB color space is a three-dimensional space, so the transformation from CMYK to RGB, though relatively simple, inherently loses color information.
In particular, the color information produced by “black generation” during creation of the CMYK image is lost.
Thus, a difficult and widely needed color transformation is the transformation from an RGB color space to a CMYK color space that retains, as closely as possible, the black generation of the original CMYK image.
. . could be implemented in one huge lookup table, but this would be uneconomic and would also give no clue as to how to find the data to be stored in the LUT short of an impossibly large printing test.” [11:21] Since the time of filing of '919 patent, the cost of memory has been reduced sufficiently that it is no longer uneconomic to use “one huge lookup table”.
However, such printing tests are time consuming and complicate the transformation process.

Method used

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  • Method for performing a color space transformation
  • Method for performing a color space transformation
  • Method for performing a color space transformation

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Embodiment Construction

[0017]FIG. 1 is a block diagram of a conventional computer system 100 capable of executing a color space transformation computer program 118. This program contains a routine that implements the method of the present invention to transform an image based in a first color space into an image based in a second color space. As such, the images can then be respectively printed and displayed on a printer 110 and a display monitor 108 even though the printer and display monitor utilize differing types of color spaces to produce an image.

[0018]Specifically, the computer system 100 contains an image input device 102, a computer 104, a user input device 106, a display monitor 108 and a printer 110. In operation, an original image is created by an image input device 102 such as a conventional image scanner. The scanned image (also referred to herein as a source image or original image) is formatted by the scanner into an image file 120 using a particular color space (e.g., RGB or CMYK). The im...

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Abstract

A method for transforming a first image defined by a first multi-dimensional color space (RGB) into second image defined by a second multi-dimensional color space (CMYK). The method computes the transformation using information derived from a previous transformation of said second image into said first image. The method then minimizes the error produced while transforming the second image back into the first image. As such, an image editing system can display on a video monitor an image that is defined in one multi-dimensional color space (RGB), print using a printer that prints images using a second multi-dimensional color space (CMYK) and edit an image using any multi-dimensional color space (either RGB or CMYK) that facilitates rapid and accurate image editing.

Description

RELATED APPLICATIONS[0001]ThisMore than one reissue application has been filed for the reissue of U.S. Pat. No. 6,621,604. The reissue applications are application Ser. Nos. 11 / 229,449 (parent of the present application), filed Sep. 16, 2005, and 11 / 468,927 (the present application), filed Aug. 31, 2006. The present application is a continuation of U.S. patent application Ser. No. 11 / 229 / 449, filed Sep. 16, 2005, which in turn is a reissue of U.S. patent application Ser. No. 09 / 860,151, filed May 16, 2001, now issued as U.S. Pat. No. 6,621,604, which is a continuation of U.S. patent application Ser. No. 08 / 267,140, filed Jun. 24, 1994, now issued as U.S. Pat. No. 6,301,025.BACKGROUND OF THE DISCLOSURE[0002]1. Field of the Invention[0003]The invention relates to image processing systems. More particularly, the invention relates to a method for accurately transforming color information between two color spaces having differing dimensions, e.g., between a red-green-blue (RGB) color spa...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): G06F3/08G03F3/08H04N1/60
CPCH04N1/6025
InventorDELEAN, BRUNO
OwnerINTELLECTUAL VENTURES I LLC