The Imagick::whiteThresholdImage() function is an inbuilt function in PHP which is used to convert all pixels above the threshold value into white. This function force all pixels above the threshold value into white while leaving all pixels below the threshold unchanged.
Syntax:
bool Imagick::whiteThresholdImage( $threshold )
Parameters: This function accepts single parameter $threshold which is used to define the changes in pixel value.
Return Value: This function returns True on success.
Below programs illustrates the Imagick::whiteThresholdImage() function in PHP:
Program:
<?php   // Create an Imagick object $imagick = new Imagick(   // Use whiteThresholdImage function $imagick->whiteThresholdImage('red');   header("Content-Type: image/jpg");   // Display the output image echo $imagick->getImageBlob(); ?> |
Output:
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Reference: http://php.net/manual/en/imagick.whitethresholdimage.php
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