The Imagick::adaptiveSharpenImage() function is an inbuilt function in PHP which provides an adaptive sharpen image feature to the image. The intensity of an adaptive sharpen image depends on dramatically decreased at the edge of the image. Syntax:
bool Imagick::adaptiveSharpenImage ( $radius, $sigma, $channel )
Parameters: This function accepts three parameters as mentioned above and described below:
- $radius: This parameter is used to set the radius of the Gaussian, in pixels. Its not counting the center pixel. If radius value is zero it means radius will be chosen automagically.
- $sigma: This parameter is used to find the standard deviation of the Gaussian, in pixels.
- $channel: This parameter provides the channel constant that is valid for channel mode. More than one channel can be combined using bitwise operator. The defaults channel in Imagick function is Imagick::CHANNEL_DEFAULT.
Return Value: This function returns TRUE on success. Below programs illustrate the Imagick::adaptiveSharpenImage() function in PHP: Original Image: 
Program:
php
<?php// require_once('path/to/vendor/autoload.php');header('Content-type: image/png');$image = new Imagick($image->adaptiveSharpenImage(19, 8);echo $image;?> |
Output: 
Reference: http://php.net/manual/en/imagick.adaptivesharpenimage.php
