Imagick::separateImageChannel

(PECL imagick 2.0.0)

Separates a channel from the image

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

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.

Returns:

Returns TRUE on success.

Exception:

Throws ImagickException on error.

Examples:

Imagick::separateImageChannel()

<?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);
 
?>

Links:

http://php.net/manual/en/imagick.separateimagechannel.php

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2025-01-10 15:47:30

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