Imagick::sigmoidalContrastImage
(PECL imagick 2.0.0)
Imagick::sigmoidalContrastImage — Adjusts the contrast of an image
Описание
bool Imagick::sigmoidalContrastImage
( bool $sharpen
, float $alpha
, float $beta
[, int $channel= Imagick::CHANNEL_ALL
] )
ВниманиеК настоящему
времени эта функция еще не была документирована; для ознакомления
доступен только список аргументов.
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.
Список параметров
-
sharpen
-
-
alpha
-
-
beta
-
-
channel
-
Возвращаемые значения
Returns TRUE on success.
Errors/Exceptions
Throws ImagickException on error.
