(PECL imagick 2, PECL imagick 3)
Imagick::adaptiveSharpenImage — Adaptively sharpen the image
public Imagick::adaptiveSharpenImage ( float $radius , float $sigma [, int $channel = Imagick::CHANNEL_DEFAULT ] ) : bool
Adaptively sharpen the image by sharpening more intensely near image edges and less intensely far from edges. This method is available if Imagick has been compiled against ImageMagick version 6.2.9 or newer.
radius
The radius of the Gaussian, in pixels, not counting the center pixel. Use 0 for auto-select.
sigma
The standard deviation of the Gaussian, in pixels.
channel
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. Defaults to Imagick::CHANNEL_DEFAULT. Refer to this list of channel constants
Returns true on success.
Example #1 A Imagick::adaptiveSharpenImage() example
Adaptively sharpen the image with radius 2 and sigma 1.
<?php
try {
$image = new Imagick('image.png');
$image->adaptiveSharpenImage(2,1);
} catch(ImagickException $e) {
echo 'Error: ' , $e->getMessage();
die();
}
header('Content-type: image/png');
echo $image;
?>
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https://www.php.net/manual/en/imagick.adaptivesharpenimage.php