Imagick::shearImageImagick::sigmoidalContrastImage
(PECL imagick 2.0.0)
Imagick::sigmoidalContrastImage — Adjusts the contrast of an image
Descrição
bool Imagick::sigmoidalContrastImage
( bool $sharpen
, float $alpha
, float $beta
[, int $channel = Imagick::CHANNEL_ALL
] )
Adjusts the contrast of an image with a non-linear sigmoidal contrast algorithm. Increase the contrast of the image using a sigmoidal transfer function without saturating highlights or shadows. Contrast indicates how much to increase the contrast (0 is none; 3 is typical; 20 is pushing it); mid-point indicates where midtones fall in the resultant image (0 is white; 50 is middle-gray; 100 is black). Set sharpen to TRUE to increase the image contrast otherwise the contrast is reduced.
Parâmetros
- sharpen
-
- alpha
-
- beta
-
- channel
-
Valor Retornado
Retorna TRUE em sucesso.
Erros
Dispara ImagickException em erro.
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Imagick::sigmoidalContrastImage
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