Color selection and/or matching in a color image

• US 8,270,709 B2
• Filed: 08/31/2006
• Issued: 09/18/2012
• Est. Priority Date: 08/31/2006
• Status: Active Grant

• Current Assignee: Corel Corporation (Corel Holdings LP)
• Original Assignee: Corel Corporation (Corel Holdings LP)
• Inventors: Lindbloom, Bruce J.
• Primary Examiner(s): AHMED, SAMIR ANWAR
• Application Number:
  US11/514,480
• Publication Number:
  US 20080056564A1
• Time in Patent Office: 2,210 Days
• Field of Search: None
• US Class Current: 382/162
• CPC Class Codes: G06T 11/001 Texturing; Colouring; Generation of texture or colour inpainting G06T5/77
• CPC Class Codes: G06V 10/56 relating to colour
• CPC Class Codes: H04N 1/62 Retouching, i.e. modification of isolated colours only or in isolated picture areas only
• CPC Class Codes: H04N 1/628 Memory colours, e.g. skin or sky

Abstract

A method or computer program product for color selection in a color image, including operations or instructions for selecting a base color in a base color portion of a color image; computing a perceptual color difference between the base color and a respective second color in the color image; comparing the perceptual color difference to a tolerance; and, identifying whether the color difference satisfies the tolerance.

Claims

1. A computer-implemented method for processing an image on a computer system comprising:

receiving an indication of a first region within an image;

processing a predetermined portion of pixels within the first region to generate a plurality of color values according to a first predetermined color space;

processing the plurality of color values to determine a dominant base color;

computing, by operation of a processors, perceptual color differences between the dominant base color and second colors in the image, the second colors being associated with pixels within a predetermined portion of the image;

comparing the perceptual color differences against a perceptual color tolerance;

classifying, by operation of the processor, the pixels in dependence upon at least the result of the comparison, wherein the classification of each pixel indicates a relative degree to which the color values of that pixel are modified by editing modifications;

presenting to a user the result of classifying the pixels within the predetermined portion of the image; and

modifying the pixels within the predetermined region of the image in dependence upon at least a previously selected process and the classification of the pixels.

2. The method according to claim 1 wherein, the indication is provided by one of a user and an analysis of the chromaticity of the image in a second predetermined chromaticity color space.

3. The method according to claim 1 wherein, classifying the pixel results in the pixels having perceptual color differences satisfying the perceptual color tolerance being identified as being of the dominant base color.

4. The method according to claim 1 wherein, classifying the pixels provides for selecting by perceptual color difference at least one of an object within the image and a second region within the image.

5. The method according to claim 1 wherein, the first predetermined color space is at least one of XYZ, L*a*b*, L*u*v*, xy, and projective transformation of an additive, linear-energy color system.

6. The method according to claim 1 wherein, computing the perceptual color difference comprises computing at least one of a difference of full color values and a difference in the L* color values when the first predetermined color space is the L*a*b* color space.

7. The method according to claim 1 wherein, presenting the result of classifying the pixels comprises providing at least one of the predetermined portion of the image with the classified pixels highlighted, the predetermined portion of the image with the classified pixels modified according to a previously selected process, a graphical representation of the classification, and a chromaticity diagram depicting the second colors.

8. The method according to claim 1 wherein, the perceptual color tolerance is established either automatically or in dependence upon an input from the user.

9. The method according to claim 1 further comprising:

repeating the steps of comparing, classifying, and presenting with different perceptual color tolerances without recalculating the perceptual color differences until at least one a user decision to apply a previously selected process with the current classification result and determination that a predetermined condition has been met.

10. One or more non-transitory computer readable media storing computer readable instructions for execution by a processor to perform a method comprising the steps of:

receiving an indication of a first region within an image;

processing a predetermined portion of pixels within the first region to generate a plurality of color values according to a first predetermined color space;

processing the plurality of color values to determine a dominant base color;

computing perceptual color differences between the dominant base color and second colors in the image, the second colors being associated with pixels within a predetermined portion of the image;

comparing the perceptual color differences against a perceptual color tolerance;

classifying, by operation of the processor, the pixels in dependence upon at least the result of the comparison, wherein the classification of each pixel indicates a relative degree to which the color values of that pixel are modified by editing modifications;

presenting to a user the result of classifying the pixels within the predetermined portion of the image; and

modifying the pixels within the predetermined region of the image in dependence upon at least a previously selected process and the classification of the pixels.