Imagick
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Imagick::unsharpMaskImage

(PECL imagick 2.0.0)

Imagick::unsharpMaskImageSharpens an image

说明

bool Imagick::unsharpMaskImage ( float $radius , float $sigma , float $amount , float $threshold [, int $channel = Imagick::CHANNEL_ALL ] )

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。


Imagick
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用户评论:

Anonymous (2009-02-24 08:00:02)

Prepare photo for web

<?php
$im 
= new Imagick($SrcFile);

$im->resizeImage $Width$Height Imagick::FILTER_QUADRATIC );
        
$im->normalizeImage();
$im->unsharpMaskImage(0.5 0.05);
        
$im->setImageFormat"jpg" );
$im->setCompressionQuality(75);

$im->writeImage$OutFile );
        
$im->removeImage();
?>

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