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PHP Imagick setImageAlphaChannel () Function

Syntax:
bool Imagick::setImageAlphaChannel (int $mode)
Parameters:This function takes one parameter, $mode,which contains an integer value corresponding to one of ALPHACHANNEL constants .The ALPHACHANNEL constants are listed below:
  • imagick: : ALPHACHANNEL_ACTIVATE (0)
  • imagick::ALPHACHANNEL_DEACTIVATE (1)
  • imagick::ALPHACHANNEL_RESET (2)
  • imagick::ALPHACHANNEL_SET (3)
  • imagick::ALPHACHANNEL_UNDEFINED (4)
  • imagick::ALPHACHANNEL_COPY (5)
  • imagick::ALPHACHANNEL_EXTRACT (6)
  • imagick::ALPHACHANNEL_OPAQUE (7)
  • imagick::ALPHACHANNEL_SHAPE (8)
  • imagick::ALPHACHANNEL_TRANSPARENT (9)
Returned value: this function returns TRUE in success.The following programs illustrate the Imagick::setImageAlphaChannel()function in PHP:Program 1:  
// Create a new imagick object $imagick = new Imagick ( https://media.engineerforengineer.org/wp-content/uploads/engineerforengineer-9 .png );  
// Set background color $imagick -> setImageBackgroundColor ( ’blue’ );  
// Set ImageAlphaChannel to 9, which matches
// imagine::ALPHACHANNEL_TRANSPARENT $imagick -> setImageAlphaChannel (9);  
// Show image header ( "Content-Type: image / png" ); echo $imagick -> getImageBlob(); ?>
Output: Program 2:  
// Create new imagick object $imagick = new Imagick ( https://media.engineerforengineer.org/wp-content/uploads/engineerforengineer-9.png );  
// Set ImageAlphaChannel to 3, which matches
// imagick::ALPHACHANNEL_SET $imagick -> setImageAlphaChannel (3);  
// Show image header ( "Content-Type: image / png" ); echo $imagick -> getImageBlob(); ?>
Output: Link: https://www.php.net/manual/en/imagick.setimagealphachannel.php

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