Color image display accuracy using green-limited gamma estimate
First Claim
1. A method comprising:
- determining an estimated value for a green gamma for a display device having red, blue and green channels based on selection of a displayed green element that appears to most closely blend with a dithered green background;
estimating initial gamma values for red and blue channels of the display device based on the estimated green gamma value;
performing a gray balance evaluation for red and blue channels relative to the green channel using the estimated initial gamma values for red and blue channels; and
modifying the estimated gamma values for red and blue color channels based on the gray balance evaluation for the red and blue color channels.
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Accused Products
Abstract
Improved color image display accuracy can be achieved across a computer network by obtaining information characterizing the color response of display devices associated with a client residing on the computer network, and using the information to modify color images delivered to the client. The information may include a gamma estimate. In one embodiment, the gamma estimate is limited to only the green color channel, without reference to the gammas for the red and blue channels. In this manner, the gamma estimate concentrates on the most dominant color channel and avoids errors that can arise due to the red-blue imbalances that are highly prevalent in many display devices. The information can be obtained, for example, by guiding the client through a color profiling process that profiles the color response of the display device. For example, such guidance may take the form of a series of instructional web pages that are delivered to the client. The web pages can be made interactive to enable collection of color characterization data from the client.
57 Citations
41 Claims
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1. A method comprising:
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determining an estimated value for a green gamma for a display device having red, blue and green channels based on selection of a displayed green element that appears to most closely blend with a dithered green background; estimating initial gamma values for red and blue channels of the display device based on the estimated green gamma value; performing a gray balance evaluation for red and blue channels relative to the green channel using the estimated initial gamma values for red and blue channels; and modifying the estimated gamma values for red and blue color channels based on the gray balance evaluation for the red and blue color channels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 39)
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14. A system comprising:
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a web server to transmit web pages to clients residing on a computer network; a color image server to transmit color images referenced by the web pages to the clients for display on display devices associated with the clients; a color profile server to guide the clients through a color profiling process and obtain information characterizing the color responses of the display devices associated with the clients, wherein the information includes an estimated initial green gamma value for the display device, the initial green gamma value being determined based on selection of a display green element that appears to most closely blend with a dithered green background, estimated red and blue gamma values based on the initial green gamma value, wherein the estimated gamma values for the red and blue channels of the display device are estimated from the initial green gamma value and modified based on a gray balance evaluation for the red and blue color channels; and one or more color correction modules to modify the color images transmitted by the color image server based on the information to improve the accuracy of the color images when displayed on the respective display device. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 40)
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25. A computer-readable medium encoded with a computer program containing instructions to cause a programmable processor to:
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determine estimated value for a green gamma for a display device based on selection of a displayed green element that appears to most closely blend with a dithered peen backgrounds, the display device having red, blue and green color channels; estimate initial gamma values for the red and blue channels of the display device based on the estimated green gamma value; perform a gray balance evaluation for red and blue channels relative to the green channel using the estimated initial gamma values for red and blue channels; and modify the estimated gamma values for red and blue color channels based on the gray balance evaluation for the red and blue color channels. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 41)
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Specification