Imagick::negateImage

(PECL imagick 2, PECL imagick 3)

Imagick::negateImage — Negates the colors in the reference image

说明

public Imagick::negateImage(bool $gray, int $channel = Imagick::CHANNEL_DEFAULT): bool

Negates the colors in the reference image. The Grayscale option means that only grayscale values within the image are negated.

参数

gray: Whether to only negate grayscale pixels within the image.
channel: Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.

返回值

成功时返回 true。

错误／异常

错误时抛出 ImagickException。

示例

示例 #1 Imagick::negateImage()

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

?>

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