= Unknown)Gmagick::separateimagechannel — Separates a channel from the image說明public Gmagick::separateimag">

Gmagick::separateimagechannel

(PECL gmagick >= Unknown)

Gmagick::separateimagechannel — Separates a channel from the image

說明

public Gmagick::separateimagechannel(int $channel): Gmagick

Separates a channel from the image and returns a grayscale image. A channel is a particular color component of each pixel in the image.

參數(shù)

channel

One of the Channel constant (Gmagick::CHANNEL_*).

返回值

The Gmagick object.

錯(cuò)誤／異常

錯(cuò)誤時(shí)拋出 GmagickException。