DJ Mike's Tutorials: PHP

ImageMagick Functions

Description:: 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.

Note: whiteThresholdImage does not work the way that the manual says it does. If you enter a non-gray color, you get a colored high contrast image.

Parameters:

Return Values

Returns TRUE on success.


<?php
$image = new Imagick("opossum.jpg"); 
$image->whitethresholdImage( "#999999" );
header("Content-type: image/jpeg");
echo $image;
?>


<?php
$image = new Imagick("opossum.jpg"); 
$image->whitethresholdImage( "#3399dd" );
header("Content-type: image/jpeg");
echo $image;
?>

^

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