Imagick::blackThresholdImage


wizard apg

FORCES all pixels of images below the threshold into black.



<?php

bool public Imagick::blackThresholdImage(mixed $threshold);
                                            
?>

$threshold


The threshold below which everything turns black.





This function returns true on success.



  1 EXERCISE   

<?php

// Run several times

$path1 = PATH2IMGW . '/jpg/3.jpg';

$str1img = 'img/results/3bth671.gif';

$im1 = new Imagick($path1);

$r = mt_rand(16, 255);
$g = mt_rand(16, 255);
$b = mt_rand(16, 255);

$rr = dechex($r);
$gg = dechex($g);
$bb = dechex($b);

$thresholdColor = '#'. "$rr$gg$bb";

$im1->blackthresholdimage($thresholdColor);

$image1 = $im1->getImageBlob();

$img = imagecreatefromstring($image1);

imagegif($img, $str1img);

echo basename($str1img); ?>
<br><br>
<img src="<?php echo $str1img; ?>"
 alt="<?php echo $str1img; ?>" 
 title="<?php echo $str1img; ?>">

 RESULT   

$thresholdColor = (#c2de15)

blackthresholdimage(#c2de15)


3bth671.gif

img/results/3bth671.gif apr