Php/docs/imagick.adaptivethresholdimage

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Imagick::adaptiveThresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::adaptiveThresholdImageSelects a threshold for each pixel based on a range of intensity


说明

public Imagick::adaptiveThresholdImage ( int $width , int $height , int $offset ) : bool

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.


参数

width
Width of the local neighborhood.
height
Height of the local neighborhood.
offset
The mean offset


返回值

成功时返回 true


范例

Example #1 Imagick::adaptiveThresholdImage()

<?phpfunction 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();}?>