Imagick::linearStretchImage
(PECL imagick 2, PECL imagick 3)
Imagick::linearStretchImage — Stretches with saturation the image intensity
Description
public Imagick::linearStretchImage ( float $blackPoint , float $whitePoint ) : bool
Stretches with saturation the image intensity.
Parameters
-
blackPoint -
The image black point
-
whitePoint -
The image white point
Return Values
Returns true on success.
Examples
Example #1 Imagick::linearStretchImage()
<?php
function linearStretchImage($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();
}
?>
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https://www.php.net/manual/en/imagick.linearstretchimage.php