Gmagick::separateimagechannel
(PECL gmagick >= Unknown)
Gmagick::separateimagechannel — Separates a channel from the image
Description
public void 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
-
Identify which channel to extract: RedChannel, GreenChannel, BlueChannel, OpacityChannel, CyanChannel, MagentaChannel, YellowChannel, BlackChannel.
Return Values
The Gmagick object on success
Errors/Exceptions
Throws an GmagickException on error.