Imagick::unsharpMaskImage

(PECL imagick 2.0.0)

Imagick::unsharpMaskImage — Sharpens an image

Description

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.

Parameters

radius
sigma
amount
threshold
channel

Return Values

Returns TRUE on success.

Errors/Exceptions

Throws ImagickException on error.

Examples

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();
}

?>

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User Contributed Notes 1 note

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Anonymous ¶

10 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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