Imagick::linearStretchImage

    (PECL imagick 2, PECL imagick 3)

    Imagick::linearStretchImage — Stretches with saturation the image intensity

    Description

    publicImagick::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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