Php/docs/imagick.linearstretchimage

• PHP Manual
• Imagick
• Stretches with saturation the image intensity

Imagick::linearStretchImage

(PECL imagick 2, PECL imagick 3)

Imagick::linearStretchImage — Stretches with saturation the image intensity

说明

public 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()

<?phpfunction 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();}?>