Imagick::adaptiveThresholdImage

(PECL imagick 2, PECL imagick 3)

Imagick::adaptiveThresholdImage — Selects a threshold for each pixel based on a range of intensity

Descrizione

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.

Elenco dei parametri

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

Valori restituiti

Restituisce true in caso di successo.

Esempi

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();
}

?>