(PECL imagick 2, PECL imagick 3)
Imagick::linearStretchImage — Étire la saturation de l'intensité de l'image
Étire la saturation de l'intensité de l'image.
blackPointLe point noir de l'image.
whitePointLe point blanc de l'image.
Retourne true en cas de succès.
Exemple #1 Exemple avec 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();
}
?>"Black" and "white" points here are pixel counts from the darkest and brightest ends respectively. To turn the darkest 90% of the pixels black, and the brightest 5% white, use the following:
<?php
$im = new Imagick ("some image.png");
list ($width, $height) = array_values ($im->getImageGeometry ());
$px = $width * $height;
$im->modulateImage (100, 0, 100);
$im->linearStretchImage ($px * 0.9, $px * 0.05);
$im->writeImage ("temp.jpg");
?>