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<Imagick::textureImageImagick::thumbnailImage>
^ImagickLast updated: Mon, 26 Oct 2026

Imagick::thresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::thresholdImage — Changes the value of individual pixels based on a threshold

Description

public function 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();
}

?>


<Imagick::textureImageImagick::thumbnailImage>
^ImagickLast updated: Mon, 26 Oct 2026