Separates a channel from the image

# Imagick::separateImageChannel

(PECL imagick 2, PECL imagick 3)

Imagick::separateImageChannel — Separates a channel from the image

### Description

public function 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

Returns `true` on success.

### Errors/Exceptions

Throws ImagickException on error.

### Examples

Example #1 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);

    ?>

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