Imagick::autoLevelImage
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Imagick::autoLevelImage — Description
说明
public
Imagick::autoLevelImage ([
int
$channel = Imagick::CHANNEL_DEFAULT ] ) :
bool
Adjusts the levels of a particular image channel by scaling the minimum and maximum values to the full quantum range.
参数
-
channel -
Which channel should the auto-levelling should be done on.
返回值
成功时返回 TRUE。
范例
Example #1 Imagick::autoLevelImage()
<?php
function autoLevelImage($imagePath) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->autoLevelImage();
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>
