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Imagick::linearStretchImage

(PECL imagick 2, PECL imagick 3)

Imagick::linearStretchImage — Stretches with saturation the image intensity

Beschreibung

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

Stretches 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();
}

?>