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Imagick::separateImageChannel

PHP function Edit on GitHub ✎

(PECL imagick 2, PECL imagick 3)

Separates a channel from the image

Description

Imagick::separateImageChannel(int $channel): bool

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: Which 'channel' to return. For colorspaces other than RGB, you can still use the CHANNEL_RED, CHANNEL_GREEN, CHANNEL_BLUE constants to indicate the 1st, 2nd and 3rd channels.

Return Values

Success

Errors/Exceptions

Throws

Examples

Imagick::separateImageChannel()

php

<?php
function separateImageChannel($imagePath, $channel) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->separateimagechannel($channel);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}

separateImageChannel($imagePath, \Imagick::CHANNEL_GREEN);

?>

Source: reference/imagick/imagick/separateimagechannel.xml · from the official PHP manual (php/doc-en)