5.5.15

Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

Imagick::whiteThresholdImageForce all pixels above the threshold into white

Descrizione

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.

Elenco dei parametri

threshold

Valori restituiti

Restituisce TRUE in caso di successo.

Log delle modifiche

Versione Descrizione
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
5 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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