Imagick::unsharpMaskImage
(PECL imagick 2, PECL imagick 3)
Imagick::unsharpMaskImage — Sharpens an image
说明
public Imagick::unsharpMaskImage
( float
$radius
, float $sigma
, float $amount
, float $threshold
, int $channel = Imagick::CHANNEL_DEFAULT
) : boolSharpens an image. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and Imagick::UnsharpMaskImage() selects a suitable radius for you.
参数
-
radius -
-
sigma -
-
amount -
-
threshold -
-
channel -
返回值
成功时返回 true。
错误／异常
错误时抛出 ImagickException。
范例
示例 #1 Imagick::unsharpMaskImage()
<?php
function unsharpMaskImage($imagePath, $radius, $sigma, $amount, $unsharpThreshold) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->unsharpMaskImage($radius, $sigma, $amount, $unsharpThreshold);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>