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PHP | Imagick sharpenImage() Function
  • Last Updated : 26 Aug, 2019

The Imagick::sharpenImage() function is an inbuilt function in PHP which is used to sharpen an image. This function convolves the image with a Gaussian operator of the given radius and standard deviation.


bool Imagick::sharpenImage( $radius, $sigma, $channel )

Parameters: This function accepts three parameter 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 then 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 program illustrates the Imagick::sharpenImage() function in PHP:


// Create an Imagick object
$imagick = new Imagick(
// Use sharpenimage function
$imagick->sharpenimage(5, 1);
header("Content-Type: image/jpg");
// Display the output image
echo $imagick->getImageBlob();

sharpen image


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