Imagick::labelImage
Imagick::linearStretchImage
The Imagick class
PHP Manual

# Imagick::levelImage

(PECL imagick 2.0.0)

Imagick::levelImage — Adjusts the levels of an image

### 설명

bool Imagick::levelImage ( float `$blackPoint` , float `$gamma` , float `$whitePoint` [, int `$channel`= Imagick::CHANNEL_ALL ] )
Warning

이 함수는 현재 문서화 되어있지 않습니다; 인수 목록만을 제공합니다.

Adjusts the levels of an image by scaling the colors falling between specified white and black points to the full available quantum range. The parameters provided represent the black, mid, and white points. The black point specifies the darkest color in the image. Colors darker than the black point are set to zero. Mid point specifies a gamma correction to apply to the image. White point specifies the lightest color in the image. Colors brighter than the white point are set to the maximum quantum value.

### 인수

`blackPoint`

  The image black point

`gamma`

  The gamma value

`whitePoint`

  The image white point

`channel`

  Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Defaults to `Imagick::CHANNEL_ALL`. Refer to this list of channel constants.

### 반환값

성공시에 `TRUE`를 반환합니다.

### 오류/예외

오류시에 ImagickException이 발생합니다.

Imagick::labelImage
Imagick::linearStretchImage
The Imagick class
PHP Manual