applyGamma_video() [3/3]

uint8_t applyGamma_video	(	uint8_t	brightness,
		float	gamma )

Applies a gamma adjustment to a color channel.

Parameters

brightness	the value of the color data
gamma	the gamma value to apply

Returns

the color data, adjusted for gamma

Definition at line 1395 of file colorutils.cpp.

{
    float orig;
    float adj;
    orig = (float)(brightness) / (255.0);
    adj =  pow( orig, gamma)   * (255.0);
    uint8_t result = (uint8_t)(adj);
    if( (brightness > 0) && (result == 0)) {
        result = 1; // never gamma-adjust a positive number down to zero
    }
    return result;
}

References brightness.

Referenced by applyGamma_video(), applyGamma_video(), napplyGamma_video(), napplyGamma_video(), napplyGamma_video(), and napplyGamma_video().

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