Imagick::thresholdImage

    (PECL imagick 2, PECL imagick 3)

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

    说明

    publicImagick::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。

    示例

    示例 #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();
    }

    ?>
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