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PHP | Imagick adaptiveBlurImage() Function

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  • Difficulty Level : Easy
  • Last Updated : 26 Aug, 2019
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The Imagick::adaptiveBlurImage() function is an inbuilt function in PHP which is used to add adaptive blur filter in the given image. The intensity of an adaptive blur depends is dramatically decreased at the edge of the image, whereas a standard blur is a uniform across the image. This effect makes the image unclear or less distinct.


bool adaptiveBlurImage ( $radius, $sigma, $channel )

Parameters: This function accepts three parameters 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 than one channel can be combined using the bitwise operator. The defaults channel in Imagick function is Imagick::CHANNEL_DEFAULT.
    Some color constant of channel list is given below:

    • imagick::COLOR_BLACK (integer)
    • imagick::COLOR_BLUE (integer)
    • imagick::COLOR_CYAN (integer)
    • imagick::COLOR_GREEN (integer)
    • imagick::COLOR_RED (integer)
    • imagick::COLOR_YELLOW (integer)
    • imagick::COLOR_MAGENTA (integer)
    • imagick::COLOR_OPACITY (integer)
    • imagick::COLOR_ALPHA (integer)
    • imagick::COLOR_FUZZ (integer)

Return Value: This function returns TRUE on success.

Exception: This function throws ImagickException on error.

Below programs illustrate the Imagick::adaptiveBlurImage() function in PHP:

Original Image:
original image


// require_once('path/to/vendor/autoload.php'); 
header('Content-type: image/png');
$image = new Imagick(
$image->adaptiveBlurImage(20, 5);
echo $image;

blur image


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