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    Imagick::normalizeImage

    (PECL imagick 2, PECL imagick 3)

    Imagick::normalizeImage — Enhances the contrast of a color image

    说明

    public Imagick::normalizeImage(int $channel = Imagick::CHANNEL_DEFAULT): bool

    Enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available.

    参数

    channel

    Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.

    返回值

    成功时返回 true。

    示例

    示例 #1 Imagick::normalizeImage()

    <?php
    function normalizeImage($imagePath, $channel) {
    $imagick = new \Imagick(realpath($imagePath));
    $original = clone $imagick;
    $original->cropimage($original->getImageWidth() / 2, $original->getImageHeight(), 0, 0);
    $imagick->normalizeImage($channel);
    $imagick->compositeimage($original, \Imagick::COMPOSITE_ATOP, 0, 0);
    header("Content-Type: image/jpg");
    echo     $imagick->getImageBlob();
    }

    ?>

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