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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. 2011-09-21 1999-2011 by Richard Alan Peters II 2
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Vector-Valued Pixels Each color corresponds to a point in a 3D vector space 2011-09-21 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. 2011-09-21 1999-2011 by Richard Alan Peters II 4
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Color Cube: Faces (outer) 2011-09-21 1999-2011 by Richard Alan Peters II 5
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Color Cube: Faces (inner) 2011-09-21 1999-2011 by Richard Alan Peters II 6
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Color Cube: Faces (inner and outer) 2011-09-21 1999-2011 by Richard Alan Peters II 7
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Color Cube: Faces (inner and outer) 2011-09-21 1999-2011 by Richard Alan Peters II 8
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Color Cube: Faces (inner and outer) 2011-09-21 1999-2011 by Richard Alan Peters II 9
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Color Cube: Faces (inner and outer) 2011-09-21 1999-2011 by Richard Alan Peters II 10
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Color Cube: Faces (inner and outer) 2011-09-21 1999-2011 by Richard Alan Peters II 11
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Color Cube: Faces (inner and outer) 2011-09-21 1999-2011 by Richard Alan Peters II 12
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Color Cube: Faces (inner and outer) 2011-09-21 1999-2011 by Richard Alan Peters II 13
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Different Axis Sets in Color Space RGB axes CMY axes 2011-09-21 1999-2011 by Richard Alan Peters II 14
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Color With Respect To Different Axes The same color has different RGB and CMY coordinates. 2011-09-21 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 2011-09-21 1999-2011 by Richard Alan Peters II 16
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Gamma Adjustment of Color Bands David Peters, producer, and representatives of the IA, The International Alliance of Theatrical Stage Employees, Moving Picture Technicians, Artists and Allied Crafts, on the set of Frozen Impact (PorchLight Entertainment, 2003). original 2011-09-21 1999-2011 by Richard Alan Peters II 17
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Gamma Adjustment of Color Bands red γ =2 2011-09-21 1999-2011 by Richard Alan Peters II 18
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Gamma Adjustment of Color Bands original 2011-09-21 1999-2011 by Richard Alan Peters II 19
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Gamma Adjustment of Color Bands red γ =0.5 reduced red = increased cyan 2011-09-21 1999-2011 by Richard Alan Peters II 20
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