Imagick::sigmoidalContrastImage()

Imagick::sigmoidalContrastImage - Adjusts the contrast of an image

Syntax

bool Imagick::sigmoidalContrastImage (bool $sharpen, float $alpha, float $beta, int $channel)

Arguments

• sharpen
• alpha
• beta
• channel

Description

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.

Version

PHP PECL imagick 2.0.0

Return value

Returns TRUE on success.