(PECL imagick 2.0.0)
Imagick::unsharpMaskImage — Sharpens an image
$radius
, float $sigma
, float $amount
, float $threshold
[, int $channel = Imagick::CHANNEL_DEFAULT
] ) : boolSharpens an image. We convolve the image with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 and Imagick::UnsharpMaskImage() selects a suitable radius for you.
radius
sigma
amount
threshold
channel
成功时返回 TRUE。
错误时抛出 ImagickException。
Example #1 Imagick::unsharpMaskImage()
<?php
function unsharpMaskImage($imagePath, $radius, $sigma, $amount, $unsharpThreshold) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->unsharpMaskImage($radius, $sigma, $amount, $unsharpThreshold);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>
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();
?>