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()


<?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();
}

?>

User Contributed Notes

Anonymous 24-Feb-2009 08:00


Prepare photo for web





<?php


$im = new Imagick($SrcFile);





$im->resizeImage ( $Width, $Height , Imagick::FILTER_QUADRATIC , 1 );


        


$im->normalizeImage();


$im->unsharpMaskImage(0 , 0.5 , 1 , 0.05);


        


$im->setImageFormat( "jpg" );


$im->setCompressionQuality(75);





$im->writeImage( $OutFile );


        


$im->removeImage();


?>