Imagick::separateImageChannel

(PECL imagick 2, PECL imagick 3)

Imagick::separateImageChannel — Separates a channel from the image

說(shuō)明

public 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.

參數(shù)

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.

返回值

成功時(shí)返回 true。

錯(cuò)誤／異常

錯(cuò)誤時(shí)拋出 ImagickException。

范例

示例 #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);

?>