Imagick
PHP Manual

Imagick::thresholdImage

Changes the value of individual pixels based on a threshold

Description

public bool Imagick::thresholdImage(float $threshold, int $channel = Imagick::CHANNEL_DEFAULT)

Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.

Parameters

threshold

channel

Return Values

Returns true on success.

Examples

Example #1 Imagick::thresholdImage

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

?>