Imagick::unsharpMaskImage

(PECL imagick 2, PECL imagick 3)

Imagick::unsharpMaskImage — Sharpens an image

说明

publicImagick::unsharpMaskImage(
    float$radius,
    float$sigma,
    float$amount,
    float$threshold,
    int$channel = Imagick::CHANNEL_DEFAULT
): bool

Sharpens 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。

示例

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();
}

?>