PHP Manual: Selectively blur an image within a contrast threshold

Description

public bool Imagick::selectiveBlurImage(
    float $radius,
    float $sigma,
    float $threshold,
    int $channel = Imagick::CHANNEL_DEFAULT
)

Selectively blur an image within a contrast threshold. It is similar to the unsharpen mask that sharpens everything with contrast above a certain threshold.

Parameters

radius
sigma
threshold
channel: Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. Defaults to Imagick::CHANNEL_DEFAULT. Refer to this list of channel constants

Return Values

Returns true on success.

Examples

Example #1 Imagick::selectiveBlurImage

<?php
function selectiveBlurImage($imagePath, $radius, $sigma, $threshold, $channel) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->selectiveBlurImage($radius, $sigma, $threshold, $channel);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}

?>