Imagick
PHP Manual

Imagick::whiteThresholdImage

Force all pixels above the threshold into white

Description

public bool Imagick::whiteThresholdImage(mixed $threshold)

Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.

Parameters

threshold

Return Values

Returns true on 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

Example #1 Imagick::whiteThresholdImage

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

?>