• 首页
  • vue
  • TypeScript
  • JavaScript
  • scss
  • css3
  • html5
  • php
  • MySQL
  • redis
  • jQuery
  • Imagick::separateImageChannel()

    (PECL imagick 2.0.0)

    Separates a channel from the image

    说明

    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.

    参数

    $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

    成功时返回TRUE

    错误/异常

    错误时抛出 ImagickException。

    范例

    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);
    ?>