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EECE253_05_ColorCorrection

# EECE253_05_ColorCorrection - EECE/CS 253 Image Processing...

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EECE/CS 253 Image Processing Richard Alan Peters II Department of Electrical Engineering and Computer Science Fall Semester 2011 Lecture Notes: Color Correction This work is licensed under the Creative Commons Attribution-Noncommercial 2.5 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/2.5/ or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.  .   . . .

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Color Images Are constructed from three overlaid intensity maps. Each map represents the intensity of a different “primary” color. The actual hues of the primaries do not matter as long as they are distinct. The primaries are 3 vectors (or axes) that form a “basis” of the color space. 12/06/11 1999-2011 by Richard Alan Peters II 2
Vector-Valued Pixels Each color corresponds to a point in a 3D vector space Each color corresponds to a point in a 3D vector space 12/06/11 1999-2011 by Richard Alan Peters II 3

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Color Space for standard digital images primary image colors red, green, and blue correspond to R,G, and B axes in color space. 8-bits of intensity resolution per color correspond to integers 0 through 255 on axes. no negative values color “space” is a cube in the first octant of 3-space. color space is discrete 256 3 possible colors = 16,777,216 elements in cube. primary image colors red, green, and blue correspond to R,G, and B axes in color space. 8-bits of intensity resolution per color correspond to integers 0 through 255 on axes. no negative values color “space” is a cube in the first octant of 3-space. color space is discrete 256 3 possible colors = 16,777,216 elements in cube. 12/06/11 1999-2011 by Richard Alan Peters II 4
Color Cube: Faces (outer) 12/06/11 1999-2011 by Richard Alan Peters II 5

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Color Cube: Faces (inner) 12/06/11 1999-2011 by Richard Alan Peters II 6
Color Cube: Faces (inner and outer) 12/06/11 1999-2011 by Richard Alan Peters II 7

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Color Cube: Faces (inner and outer) 12/06/11 1999-2011 by Richard Alan Peters II 8
Color Cube: Faces (inner and outer) 12/06/11 1999-2011 by Richard Alan Peters II 9

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Color Cube: Faces (inner and outer) 12/06/11 1999-2011 by Richard Alan Peters II 10
Color Cube: Faces (inner and outer) 12/06/11 1999-2011 by Richard Alan Peters II 11

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Color Cube: Faces (inner and outer) 12/06/11 1999-2011 by Richard Alan Peters II 12
Color Cube: Faces (inner and outer) 12/06/11 1999-2011 by Richard Alan Peters II 13

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Different Axis Sets in Color Space RGB axes CMY axes 12/06/11 1999-2011 by Richard Alan Peters II 14
Color With Respect To Different Axes The same color has different RGB and CMY coordinates. 12/06/11 1999-2011 by Richard Alan Peters II 15

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Color Correction Global changes in the coloration of an image to alter its tint, its hues or the saturation of its colors with minimal changes to its luminant features 12/06/11 1999-2011 by Richard Alan Peters II 16
Gamma Adjustment of Color Bands David Peters, producer, and representatives of the IA, The International Alliance of Theatrical Stage Employees, Moving Picture

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