DJ Mike's Tutorials: PHP

Imagick Functions

Imagick::separateImagechannel

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

Channel constants

imagick::CHANNEL_UNDEFINED
imagick::CHANNEL_RED
imagick::CHANNEL_GRAY
imagick::CHANNEL_CYAN
imagick::CHANNEL_GREEN
imagick::CHANNEL_MAGENTA
imagick::CHANNEL_BLUE
imagick::CHANNEL_YELLOW
imagick::CHANNEL_ALPHA
imagick::CHANNEL_OPACITY
imagick::CHANNEL_MATTE
imagick::CHANNEL_BLACK
imagick::CHANNEL_INDEX
imagick::CHANNEL_ALL

Return Values

Returns TRUE on success.

Errors/Exceptions

Throws ImagickException on error.

Example

<?php
header("Content-type: image/jpeg");
$image = new Imagick("opossum.jpg"); 
$image->separateImagechannel( imagick::CHANNEL_BLUE );
echo $image;
?> 

^

Created by DJ Mike from Santa Barbara