Php/docs/imagick.unsharpmaskimage

• PHP Manual
• Imagick
• Sharpens an image

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 ] ) : 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()

<?phpfunction 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();}?>