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   // Create an Imagick object $imagick = new Imagick(   // Use blackthresholdimage function $imagick->blackthresholdimage('rgb(127, 127, 127)');   header("Content-Type: image/jpg");       // Display the output image echo $imagick->getImageBlob(); ?> |
Output:
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Reference: http://php.net/manual/en/imagick.blackthresholdimage.php
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