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。

add a note User Contributed Notes Imagick::unsharpMaskImage - [1 notes]

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Anonymous ¶

4 years ago


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();


?>

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