Imagick::autoLevelImage

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Imagick::autoLevelImage — Description

说明

public void Imagick::autoLevelImage ([ string $CHANNEL = Imagick::CHANNEL_DEFAULT ] )

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

范例

Example #1 Imagick::autoLevelImage()

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

 ?>