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CSS

The value of ‘radius’ defines the value of the standard deviation to the Gaussian function, or how many pixels on the screen blend into each other, so a larger value will create more blur. If no parameter is provided, then a value 0 is used. The parameter is specified as a CSS length, but does not accept percentage values.

.img_blur {
  -webkit-filter: blur(18px);
  filter: blur(18px);
}

Demo codepen.io

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PHP

Imagick::adaptiveBlurImage

Adds an adaptive blur filter to image. The intensity of an adaptive blur depends is dramatically decreased at edge of the image, whereas a standard blur is uniform across the image. This method is available if Imagick has been compiled against ImageMagick version 6.2.9 or newer.

header('Content-type: image/jpeg');
$image = new Imagick('img.jpg');
$image->blurImage(5,3);
echo $image;

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Designer Edmonton