Imagick::linearStretchImage
(PECL imagick 2, PECL imagick 3)
Imagick::linearStretchImage — Stretches with saturation the image intensity
Beschreibung
$blackPoint
, float $whitePoint
): boolStretches with saturation the image intensity.
Parameter-Liste
-
blackPoint
-
The image black point
-
whitePoint
-
The image white point
Rückgabewerte
Liefert true
bei Erfolg.
Beispiele
Beispiel #1 Imagick::linearStretchImage()
<?php
function linearStretchImage($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();
}
?>