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PHP | Imagick gaussianBlurImage() Function

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  • Last Updated : 09 Jul, 2019
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The Imagick::gaussianBlurImage() function is an inbuilt function in PHP which is used to blur an image. This function convolves the image with a Gaussian operator of the given radius and standard deviation (sigma).

Note: For reasonable results, the radius should be larger than sigma.


bool Imagick::gaussianBlurImage( $radius, $sigma, $channel = Imagick::CHANNEL_DEFAULT )

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

  • $radius (float type): This parameter gives the radius of the Gaussian area in pixels, excluding the center pixel.
  • $sigma (Float type): This parameter gives the standard deviation of the Gaussian area in pixels.
  • $channel (Int type): This parameter gives a channel (that is valid) as per our requirement. To apply more than one channel, use bitwise operator to combine channel-type constants.

Return Value: This function returns True on success.

Errors: This function throws ImagickException on error.

Original Image:

Now, we will write a PHP program that illustrates the Imagick::gaussianBlurImage() function in PHP to blur the above image.

Program: This program uses Imagick::gaussianBlurImage() function to blur the image.

// Create an Imagick object
$imagick = new Imagick(
// Use gaussianBlurImage() function to blur the image
$imagick->gaussianBlurImage(10, 8, Imagick::CHANNEL_DEFAULT);
// Image header
header("Content-Type: image/jpg");
// Display the output image
echo $imagick->getImageBlob();


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