Home/ Manual/ imagick / imagick/ Imagick::blackThresholdImage

Imagick::blackThresholdImage

PHP function Edit on GitHub ✎

(PECL imagick 2, PECL imagick 3)

Forces all pixels below the threshold into black

Description

Imagick::blackThresholdImage(mixed $threshold): bool

Is like Imagick::thresholdImage() but forces all pixels below the threshold into black while leaving all pixels above the threshold unchanged.

Parameters

threshold: The threshold below which everything turns black

Return Values

Success

Changelog

Version	Description
PECL imagick 2.1.0	Now allows a string representing the color as a parameter. Previous versions allow only an ImagickPixel object.

Examples

Imagick::blackThresholdImage()

php

<?php
function blackThresholdImage($imagePath, $thresholdColor) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->blackthresholdimage($thresholdColor);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}

?>

Source: reference/imagick/imagick/blackthresholdimage.xml · from the official PHP manual (php/doc-en)