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Imagick::adaptiveThresholdImage

(PECL imagick 2, PECL imagick 3)

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

Description

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.

Parameters

width

Width of the local neighborhood.

height

Height of the local neighborhood.

offset

The mean offset

Return Values

Returns true on success.

Examples

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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https://www.php.net/manual/en/imagick.adaptivethresholdimage.php