Gmagick::scaleimage

Gmagick::setCompressionQuality

Gmagick::separateimagechannel

Separates a channel from the image

Description

public Gmagick Gmagick::separateimagechannel(int $channel)

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

Parameters

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

Return Values

The Gmagick object.

Errors/Exceptions

Throws an GmagickException on error.