Imagick::adaptiveThresholdImage
(PECL imagick 2.0.0)
Imagick::adaptiveThresholdImage — Selects a threshold for each pixel based on a range of intensity
설명
bool Imagick::adaptiveThresholdImage
( int
$width
, int $height
, int $offset
)Selects an individual threshold for each pixel based on the range of intensity values in its local neighborhood. This allows for thresholding of an image whose global intensity histogram doesn't contain distinctive peaks.
인수
-
width -
Width of the local neighborhood.
-
height -
Height of the local neighborhood.
-
offset -
The mean offset
반환값
성공시에 TRUE를 반환합니다.
예제
Example #1 Imagick::adaptiveThresholdImage()
<?php
function adaptiveThresholdImage($imagePath, $width, $height, $adaptiveOffset) {
$imagick = new \Imagick(realpath($imagePath));
$adaptiveOffsetQuantum = intval($adaptiveOffset * \Imagick::getQuantum());
$imagick->adaptiveThresholdImage($width, $height, $adaptiveOffsetQuantum);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>
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