Php/docs/imagick.autolevelimage

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Imagick::autoLevelImage

(PECL imagick 3 >= 3.3.0)

Imagick::autoLevelImageDescription


说明

public Imagick::autoLevelImage ([ int $channel = Imagick::CHANNEL_DEFAULT ] ) : bool

Adjusts the levels of a particular image channel by scaling the minimum and maximum values to the full quantum range.


参数

channel
Which channel should the auto-levelling should be done on.


返回值

成功时返回 true


范例

Example #1 Imagick::autoLevelImage()

<?phpfunction autoLevelImage($imagePath) {    $imagick = new \Imagick(realpath($imagePath));    $imagick->autoLevelImage();    header("Content-Type: image/jpg");    echo $imagick->getImageBlob();}?>