PHP 7.0.0 RC 2 Released

Imagick::linearStretchImage

(PECL imagick 2.0.0)

Imagick::linearStretchImageÉtire la saturation de l'intensité de l'image

Description

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

Étire la saturation de l'intensité de l'image.

Liste de paramètres

blackPoint

Le point noir de l'image.

whitePoint

Le point blanc de l'image.

Valeurs de retour

Returns TRUE on success.

Exemples

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();
}

?>

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SkepticaLee
1 year ago
"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");
?>
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