(PECL imagick 2, PECL imagick 3)
Imagick::thresholdImage — Changes the value of individual pixels based on a threshold
public Imagick::thresholdImage ( float $threshold [, int $channel = Imagick::CHANNEL_DEFAULT ] ) : bool
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
Returns true
on success.
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https://www.php.net/manual/en/imagick.thresholdimage.php