Imagick::unsharpMaskImage
(PECL imagick 2.0.0)
Imagick::unsharpMaskImage — Sharpens an image
说明
$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。
范例
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 ();
}
?> 用户评论:
[#1] Anonymous [2009-02-24 08:00:02]
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();
?>