PHP Manual: Forces all pixels below the threshold into black

Description

bool Imagick::blackThresholdImage ( mixed $threshold )

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

Returns TRUE on success.

Changelog

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

Examples

Example #1 Imagick::blackThresholdImage


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

?>