Method and apparatus for applying tonal correction to images

Details Method and apparatus for applying tonal correction to images Method and apparatus for applying tonal correction to images

2011-08-02

2011-08-02

Selby, Gevell (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S234000, C348S255000

Reexamination Certificate

active

07990427

ABSTRACT:
A method and apparatus for applying tonal correction to images to obtain a more pleasing photographic image by redistributing low-key, mid-tone and high-key tones. Luminance is calculated by using formulas appropriate for the color space or directly inputted. Two color-difference components are computed for the original image. Luminance is subjected to a tonal correction function to obtain a tonal corrected luminance. Luminance gain is calculated and applied to the color-difference components to obtain two tonal corrected color-difference components. The tonal corrected luminance and two tonal corrected color-difference components can be directly output or used to calculate three color component signals for the desired color space.

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