Imagick::whiteThresholdImage

(PECL imagick 2.0.0)

Imagick::whiteThresholdImage — Force all pixels above the threshold into white

Description

bool Imagick::whiteThresholdImage ( mixed $threshold )

Warning

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

Is like Imagick::ThresholdImage() but force all pixels above the threshold into white while leaving all pixels below the threshold unchanged.

Parameters

threshold

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::whiteThresholdImage

elmer at web-axis dot net
30-Nov-2008 11:32


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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Imagick::writeImage

Imagick::waveImage

Last updated: Fri, 20 Nov 2009