Imagick
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Imagick::unsharpMaskImage

(PECL imagick 2.0.0)

Imagick::unsharpMaskImage — Sharpens 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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PHP手册
PHP手册 - N: Sharpens an image

用户评论:

Anonymous (24-Feb-2009 04:00)

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();
?>