Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

Imagick::whiteThresholdImageForce all pixels above the threshold into white

Beschreibung

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.

Parameter-Liste

threshold

R├╝ckgabewerte

Liefert TRUE bei Erfolg.

Changelog

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

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elmer at web-axis dot net
6 years ago
Here's a example of this function:

<?php
  $img
= new Imagick();
 
$img->readImage($image_file_name);
 
$img->whiteThresholdImage('grey');
 
$img->writeImage($thumb_file_name);
 
$img->clear();
 
$img->destroy();
?>
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