Imagick::shearImage
Imagick::sketchImage
The Imagick class
PHP Manual

# Imagick::sigmoidalContrastImage

(PECL imagick 2.0.0)

Imagick::sigmoidalContrastImage — Adjusts the contrast of an image

### 설명

bool Imagick::sigmoidalContrastImage ( bool `$sharpen` , float `$alpha` , float `$beta` [, int `$channel`= Imagick::CHANNEL_ALL ] )
Warning

이 함수는 현재 문서화 되어있지 않습니다; 인수 목록만을 제공합니다.

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.

### 인수

`sharpen`

`alpha`

`beta`

`channel`

### 반환값

성공시에 `TRUE`를 반환합니다.

### 오류/예외

오류시에 ImagickException이 발생합니다.

Imagick::shearImage
Imagick::sketchImage
The Imagick class
PHP Manual