Computer graphics processing and selective visual display system – Computer graphics processing – Graph generating
Reexamination Certificate
1997-05-30
2001-03-20
Zimmerman, Mark (Department: 2772)
Computer graphics processing and selective visual display system
Computer graphics processing
Graph generating
C382S167000
Reexamination Certificate
active
06204858
ABSTRACT:
BACKGROUND
The invention relates to adjusting color in digital images.
A digital image is a raster of rows and columns of picture elements, or “pixels”, each of which include information such as color data. Color data describes the pixel color using any of a variety of color systems. For example, in the RGB (red-green-blue) system, colors are represented as a combination of red, green, and blue components. Color data for a pixel thus includes numerical values reflecting the intensities of the red, green, and blue components of the pixel color. Other color systems include CMYK (cyan-magenta-yellow-key) and HSV (hue-saturation-value), which similarly represent colors as combinations of their respective color components.
Applications exist that allow a user to adjust the color of a digital image. In some applications, the user can manually adjust the color of a pixel by methods such as replacing the existing color data with the desired color data, enhancing or reducing a specified color component, or mixing the existing color data with color data for another color. However, it can be a time consuming process for the user to identify specific pixels and to adjust the color data of those pixels until the desired color is achieved.
SUMMARY
In general, in one aspect, the invention features a computer-implemented method to adjust color data of pixels of a digital image by identifying pixels of a digital image having original color data corresponding to predetermined color and shape characteristics and adjusting the original color data of the identified pixels to achieve a desired result.
Certain implementations of the invention may include one or more of the following features. The method includes defining a portion of a digital image in response to user input, where the identification of pixels identifies only pixels of the digital image within the user-defined portion.
Identifying pixels of a digital image having original color data corresponding to predetermined color and shape characteristics filters the digital image based on predetermined color characteristics and using filters corresponding to predetermined shape characteristics. Pixels of the digital image having original color data corresponding to predetermined color and shape characteristics are identified by creating color enhanced data for the pixels of the digital image based on the original color data, and filtering the color enhanced data for the digital image based on predetermined color characteristics and using filters corresponding to predetermined shape characteristics. The digital image may be filtered by convolving color data of the pixels of the digital image with the filters.
The method includes verifying that the identified pixels actually correspond to predetermined color and shape characteristics, based on user input.
The predetermined color and shape characteristics correspond to a red eye effect. The identified pixels correspond to a portion of an eye in the digital image, and adjusting the original color data of the identified pixels determines an iris color, reduces a red component in the original color data of the identified pixels, and modifies the original color data towards achieving the iris color. Determining the iris color includes identifying pixels of the digital image corresponding to an iris area of an eye affected by the red eye effect, and evaluating the color data of the iris pixels to determine the iris color. Determining the iris color may alternatively use a default color, which may be selected by a user.
In general, in another aspect, the invention enables use of the computer-implemented method using a memory device storing computer-readable instructions for aiding a computer to adjust color data of pixels of a digital image.
In general, in another aspect, the invention provides an apparatus to adjust color data of pixels of a digital image, comprising a storage medium to store a digital image and a processor operatively coupled to the storage medium and configured to perform the computer-implemented method.
Among the advantages of the invention are one or more of the following. The invention identifies pixels of color images to be adjusted for the user. The invention automatically adjusts the color data of identified pixels.
Other features and advantages of the invention will become apparent from the following description and from the claims.
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Adobe Systems Incorporated
Cao Huedung X.
Fish & Richardson P.C.
Zimmerman Mark
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