PHP | Imagick unsharpMaskImage() Function

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.

Syntax:

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:

Program:

<?php

// Create an Imagick object
$imagick = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png');

// Use unsharpMaskImage function
$imagick->unsharpMaskImage(5, 1, 5, 0);

header("Content-Type: image/jpg");

// Display the output image
echo $imagick->getImageBlob();
?>

Output:

Reference: http://php.net/manual/en/imagick.unsharpmaskimage.php