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Imagick::thresholdImage

(PECL imagick 2.0.0)

Imagick::thresholdImageChanges the value of individual pixels based on a threshold

Descrierea

bool Imagick::thresholdImage ( float $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.

Parametri

threshold

channel

Valorile întoarse

Întoarce TRUE în caz de succes.

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User Contributed Notes 1 note

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php t traction dot de
2 years ago
getQuantumRange() can be handy here:

<?php
$i
= new Imagick($imageFile);
$max = $i->getQuantumRange();
$max = $max["quantumRangeLong"];
$i->thresholdImage(0.77 * $max);
?>
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