PHP | Gmagick getimagechanneldepth() Function

The Gmagick::getimagechanneldepth() function is an inbuilt function in PHP which is used to return the depth for channel image.

Syntax:

int Gmagick::getimagechanneldepth( $channel_type )

Parameters: This function accepts a single parameter $channel_type which holds the channel constant that is valid for channel mode. The default value of channel is Gmagick::CHANNEL_DEFAULT.



Return Value: This function returns the depth of channel.

Below programs illustrate the Gmagick::getimagechanneldepth() function in PHP:

Original Image 1:
https://media.geeksforgeeks.org/wp-content/uploads/geeks-21.png
Program 1:

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<?php
   
// Create new Gmagick object
$im = new Gmagick(
   
// Using getimagechanneldepth function
// with different channel
echo $im->getimagechanneldepth(Gmagick::CHANNEL_RED) . "</br>";
echo $im->getimagechanneldepth(Gmagick::CHANNEL_GRAY) . "</br>";
echo $im->getimagechanneldepth(Gmagick::CHANNEL_CYAN) . "</br>";
echo $im->getimagechanneldepth(Gmagick::CHANNEL_GREEN) . "</br>";
echo $im->getimagechanneldepth(Gmagick::CHANNEL_BLUE) . "</br>";
  
?>

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Output:

8
8
8
8
8

Original Image 2:
https://media.geeksforgeeks.org/wp-content/uploads/Screenshot-from-2018-10-16-23-23-54.png
Program 2:

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<?php 
   
$string = "Computer Science portal for Geeks!"
   
// Creating new image of above String 
// and add color
$im = new Gmagick(); 
$draw = new GmagickDraw(); 
   
// Fill the color in image 
$draw->setFillColor(new GmagickPixel('green')); 
   
// Set the text font size 
$draw->setFontSize(50); 
   
$metrix = $im->queryFontMetrics($draw, $string); 
$draw->annotation(0, 40, $string); 
$im->newImage($metrix['textWidth'], $metrix['textHeight'], 
        new GmagickPixel('white')); 
  
// Draw the image         
$im->drawImage($draw); 
$im->setImageFormat('jpeg'); 
   
// Using getImageChannelDepth function
// with different channel
echo $im->getimagechanneldepth(Gmagick::CHANNEL_RED) . "</br>";
echo $im->getimagechanneldepth(Gmagick::CHANNEL_GRAY) . "</br>";
echo $im->getimagechanneldepth(Gmagick::CHANNEL_CYAN) . "</br>";
echo $im->getimagechanneldepth(Gmagick::CHANNEL_GREEN) . "</br>";
echo $im->getimagechanneldepth(Gmagick::CHANNEL_BLUE) . "</br>";
?>

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Output:

8
8
8
16
8

Reference: http://php.net/manual/en/gmagick.getimagechanneldepth.php



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