Imagick::linearStretchImage

(PECL imagick 2.0.0)

Imagick::linearStretchImage — Stretches with saturation the image intensity

说明

Imagick::linearStretchImage ( float $blackPoint , float $whitePoint ) : bool

Stretches with saturation the image intensity.

参数

blackPoint: The image black point
whitePoint: The image white point

返回值

成功时返回 TRUE。

范例

Example #1 Imagick::linearStretchImage()


<?php
function linearStretchImage($imagePath, $blackThreshold, $whiteThreshold) {
    $imagick = new \Imagick(realpath($imagePath));
    $pixels = $imagick->getImageWidth() * $imagick->getImageHeight();
    $imagick->linearStretchImage($blackThreshold * $pixels, $whiteThreshold * $pixels);

    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}

?>