Imagick::blackThresholdImage

(PECL imagick 2.0.0)

Imagick::blackThresholdImage — Forces all pixels below the threshold into black

Description

bool Imagick::blackThresholdImage ( mixed $threshold )

Warning

This function is currently not documented; only its argument list is available.

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

Parameters

threshold: The threshold below which everything turns black

Return Values

Returns TRUE on success.

Changelog

Version	Description
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::blackThresholdImage

elmer at web-axis dot net
01-Dec-2008 12:33


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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Last updated: Fri, 20 Nov 2009