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Imagick::linearStretchImage

(PECL imagick 2, PECL imagick 3)

Imagick::linearStretchImageStretches 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