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Imagick::blurImage> <Imagick::averageImages
[edit] Last updated: Fri, 24 Feb 2012

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Imagick::blackThresholdImage

(PECL imagick 2.0.0)

Imagick::blackThresholdImageForces all pixels below the threshold into black

Descrição

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.

Parâmetros

threshold

The threshold below which everything turns black

Valor Retornado

Retorna TRUE em sucesso.

Histórico

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



add a note add a note User Contributed Notes Imagick::blackThresholdImage
Iddles 06-Jul-2011 05:35
You need to pass this function a colour:

<?php

$img
->blackThresholdImage( "#FFFFFF" );

?>

E.g. this blackens any pixel which isn't pure white.
elmer at web-axis dot net 30-Nov-2008 03:33
Here's a example of this function:

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

 
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