Imagick
PHP Manual

Imagick::separateImageChannel

Separates a channel from the image

Description

bool Imagick::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

Return Values

Returns TRUE on success.

Errors/Exceptions

Throws ImagickException on error.