Imagick::unsharpMaskImage

(PECL imagick 2.0.0)

Imagick::unsharpMaskImage — Sharpens an image

说明

Imagick::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。

范例

Example #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();
}

?>