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Imagick::blackThresholdImage

(PECL imagick 2.0.0)

Imagick::blackThresholdImageForces all pixels below the threshold into black

Beschreibung

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.

Parameter-Liste

threshold

The threshold below which everything turns black

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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User Contributed Notes 2 notes

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0
Iddles
3 years ago
You need to pass this function a colour:

<?php

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

?>

E.g. this blackens any pixel which isn't pure white.
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0
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->blackThresholdImage('grey');
 
$img->writeImage($thumb_file_name);
 
$img->clear();
 
$img->destroy();
?>
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