Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

Imagick::whiteThresholdImage — Force 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

Rückgabewerte

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.

add a note User Contributed Notes Imagick::whiteThresholdImage

elmer at web-axis dot net 30-Nov-2008 03:32


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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