(PECL imagick 2.0.0)
Changes the value of individual pixels based on a threshold
bool Imagick::thresholdImage ( float $threshold [, int $channel = Imagick::CHANNEL_ALL ] )
Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.
Parameters:
threshold
Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.
channel
Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image.
Returns:
Returns TRUE on success.
Examples:
Imagick::thresholdImage()
<?php
function thresholdimage($imagePath, $threshold, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->thresholdimage($threshold * \Imagick::getQuantum(), $channel);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>
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