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PHP | Imagick getImageAlphaChannel() Function

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The Imagick::getImageAphaChannel() function is an inbuilt function in PHP which is used to get the image alpha channel. The returned value is one of the ALPHACHANNEL constants.

Syntax:

int Imagick::getImageAlphaChannel( void )

Parameters: This function does not accept any parameters.

Exceptions: This function throws ImagickException on error.

Return Value: This function returns an integer value on success.

List of ALPHACHANNEL constants are given 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)

Below programs illustrate the Imagick::getImageAlphaChannel() function in PHP:

Program 1:




<?php
  
// Create a new imagick object with a PNG image
$imagick = new Imagick(
  
// Get the Alpha Channel
$alphaChannel = $imagick->getImageAlphaChannel();
  
echo $alphaChannel;
?>


Output:

1 ( which corresponds to imagick::ALPHACHANNEL_DEACTIVATE. )

Program 2:




<?php
   
// Create a new imagick object with a PNG image
$imagick = new Imagick(
   
// Get the Alpha Channel
$alphaChannel = $imagick->getImageAlphaChannel();
   
echo $alphaChannel . "<br>";
  
// Set the alpha channel
$alphaChannel = $imagick->setImageAlphaChannel(imagick::ALPHACHANNEL_RESET );
// Get the Alpha Channel
$alphaChannel = $imagick->getImageAlphaChannel();
   
echo $alphaChannel;
?>


Output:

0
1

Reference: https://www.php.net/manual/en/imagick.getimagealphachannel.php



Last Updated : 15 Nov, 2019
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