Imagick::shearImageImagick::sigmoidalContrastImage
(PECL imagick 2.0.0)
Imagick::sigmoidalContrastImage — Adjusts the contrast of an image
Description
This function is currently not documented; only its argument list is available.
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.
Parameters
- sharpen
-
- alpha
-
- beta
-
- channel
-
Return Values
Returns TRUE on success.
Errors/Exceptions
Throws ImagickException on error.
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