Php/docs/imagick.thresholdimage

• PHP Manual
• Imagick
• Changes the value of individual pixels based on a threshold

Imagick::thresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::thresholdImage — Changes the value of individual pixels based on a threshold

说明

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.

参数

threshold

channel

返回值

成功时返回 true。

范例

Example #1 Imagick::thresholdImage()

<?phpfunction thresholdimage($imagePath, $threshold, $channel) {    $imagick = new \Imagick(realpath($imagePath));    $imagick->thresholdimage($threshold * \Imagick::getQuantum(), $channel);    header("Content-Type: image/jpg");    echo $imagick->getImageBlob();}?>