(PECL imagick 2.0.0)
Imagick::negateImage — Negates the colors in the reference image
$gray
[, int $channel = Imagick::CHANNEL_DEFAULT
] ) : boolNegates the colors in the reference image. The Grayscale option means that only grayscale values within the image are negated.
grayWhether to only negate grayscale pixels within the image.
channelProvide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.
成功时返回 TRUE。
错误时抛出 ImagickException。
Example #1 Imagick::negateImage()
<?php
function negateImage($imagePath, $grayOnly, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->negateImage($grayOnly, $channel);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>