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PHP | Imagick blackThresholdImage() Function

Last Updated : 26 Aug, 2019
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The Imagick::blackThresholdImage() function is an inbuilt function in PHP which forces all pixels below the threshold value into black while leaving all pixels above the threshold unchanged. Syntax: 
bool Imagick::blackThresholdImage( $threshold )
Parameters: This function accepts a single parameter $threshold which is mandatory. All the pixel value below threshold value which everything turns black. Return Value: This function returns True on success. Below program illustrates the Imagick::blackThresholdImage() function in PHP: Program: php 
<?php

// Create an Imagick object
$imagick = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png');

// Use blackthresholdimage function
$imagick->blackthresholdimage('rgb(127, 127, 127)');

header("Content-Type: image/jpg");
    
// Display the output image
echo $imagick->getImageBlob();
?>
Output: Related Articles: Reference: http://php.net/manual/en/imagick.blackthresholdimage.php

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PHP | Imagick blackThresholdImage() Function

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