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(   // Use unsharpMaskImage function $imagick->unsharpMaskImage(5, 1, 5, 0);   header("Content-Type: image/jpg");   // Display the output image echo $imagick->getImageBlob(); ?> |
Output:
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Reference: http://php.net/manual/en/imagick.unsharpmaskimage.php
