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Gmagick::separateimagechannel

(PECL gmagick >= Unknown)

Gmagick::separateimagechannelSeparates a channel from the image

说明

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.

参数

channel

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

返回值

The Gmagick object.

错误/异常

错误时抛出 GmagickException

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