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PHP | Imagick unsharpMaskImage() Function

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  • Last Updated : 26 Aug, 2019
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The Imagick::unsharpMaskImage() 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::unsharpMaskImage( $radius, $sigma, $amount, 
$threshold, $channel )

Parameters: This function accepts five parameters as mentioned above and described below:

  • $radius: This parameter is used to set the radius of image where set the unsharp masking image.
  • $sigma: This parameter is used to set the standard deviation.
  • $amount: This parameter is used to set the amount to change the image.
  • $threshold: This parameter set the threshold value.
  • $channel: This parameter set the channel of image. CHANNEL_DEFAULT is used as a default channel.

Return Value: This function return True on success.

Errors/Exceptions: This function throws ImagickException on error.

Below programs illustrates the Imagick::unsharpMaskImage() function in PHP:


// Create an Imagick object
$imagick = new Imagick(
// Use unsharpMaskImage function
$imagick->unsharpMaskImage(5, 1, 5, 0);
header("Content-Type: image/jpg");
// Display the output image
echo $imagick->getImageBlob();


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