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Imagick::blurImage> <Imagick::averageImages
Last updated: Fri, 20 Nov 2009

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Imagick::blackThresholdImage

(PECL imagick 2.0.0)

Imagick::blackThresholdImageForces all pixels below the threshold into black

Opis

bool Imagick::blackThresholdImage ( mixed $threshold )
Ostrzeżenie

Ta funkcja jest obecnie nieudokumentowana, dostępna jest jedynie lista jej argumentów.

Is like Imagick::thresholdImage() but forces all pixels below the threshold into black while leaving all pixels above the threshold unchanged.

Parametry

threshold

The threshold below which everything turns black

Zwracane wartości

Zwraca TRUE w przypadku sukcesu.

Rejestr zmian

Wersja Opis
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
elmer at web-axis dot net
30-Nov-2008 11:33
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();
?>

Imagick::blurImage> <Imagick::averageImages
Last updated: Fri, 20 Nov 2009
 
 
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