Imagick::contrastImage

    (PECL imagick 2, PECL imagick 3)

    Imagick::contrastImage — Change the contrast of the image

    说明

    publicImagick::contrastImage(bool$sharpen): bool

    Enhances the intensity differences between the lighter and darker elements of the image. Set sharpen to a value other than 0 to increase the image contrast otherwise the contrast is reduced.

    参数

    sharpen

    The sharpen value

    返回值

    成功时返回 true。

    错误／异常

    错误时抛出 ImagickException。

    示例

    示例 #1 Imagick::contrastImage()

    <?php
    function contrastImage($imagePath, $contrastType) {
    $imagick = new \Imagick(realpath($imagePath));
    if (    $contrastType != 2) {
    $imagick->contrastImage($contrastType);
    }

    header("Content-Type: image/jpg");
    echo     $imagick->getImageBlob();
    }

    ?>
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