Imagick::thresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::thresholdImageChanges the value of individual pixels based on a threshold

Description

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

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();
}

?>