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(PECL imagick 2.0.0)
Imagick::thresholdImage — Changes the value of individual pixels based on a threshold
$threshold
[, int $channel
= Imagick::CHANNEL_ALL
] )Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.
threshold
channel
成功时返回 TRUE
。
Example #1 Imagick::thresholdImage()
<?php
function thresholdimage ( $imagePath , $threshold , $channel ) {
$imagick = new \ Imagick ( realpath ( $imagePath ));
$imagick -> thresholdimage ( $threshold * \ Imagick :: getQuantum (), $channel );
header ( "Content-Type: image/jpg" );
echo $imagick -> getImageBlob ();
}
?>
[#1] php t traction dot de [2012-06-29 07:25:11]
getQuantumRange() can be handy here:
<?php
$i = new Imagick($imageFile);
$max = $i->getQuantumRange();
$max = $max["quantumRangeLong"];
$i->thresholdImage(0.77 * $max);
?>