Monitor gamma determination and correction

Details Monitor gamma determination and correction Monitor gamma determination and correction

1996-05-20

1999-06-08

Chow, Dennis-Doon

Computer graphics processing and selective visual display system

Display peripheral interface input device

358519, 348674, G09G 504

Patent

active

059107960

ABSTRACT:
A computer-implemented method of performing gamma correction for a display device is provided. The display device is capable of displaying images using three color components, such as red, green, and blue. A first color bar image is displayed on the display device. The first color bar image has a constant intensity for two of the color components and a linear scale of intensity along a coordinate axis for the third color component. A second color bar image is also displayed which has a constant intensity for the first two color components and a constant average intensity for the third color component. A user input is then received specifying a location on the first color bar image at which the color of the first color bar image appears to match the overall color of the second color bar image. An estimate of the gamma of the display device is determined based on the location specified by the user input. Next, a correction value is determined based on the estimate of the gamma. The second color bar image is then redisplayed using the correction value, such that the color of the second color bar image is pure gray if the estimate of the gamma was correct. The estimate of the gamma can then be utilized to provide gamma correction for the display device.

REFERENCES:
patent: 5155588 (1992-10-01), Levien
patent: 5381349 (1995-01-01), Winter et al.
patent: 5483259 (1996-01-01), Sachs
patent: 5570108 (1996-10-01), McLaughlin et al.
patent: 5638117 (1997-06-01), Engeldrum et al.
"Adobe Photoshop Tutorial" pp. 4-6, Adobe Photoshop version 2.5, Adobe Systems Incorporated, 1993.
"A note on gama correction and images", Graeme W. Gill, May 16, 1993.

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