PHP 7.2.0 Release Candidate 4 Released

Imagick::adaptiveThresholdImage

(PECL imagick 2.0.0)

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

说明

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.

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()

<?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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