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:

Program 1:

php

<?php

// Create new Gmagick object
$im = new Gmagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-15.png');

// 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>";

?>

Output:

8
8
8
8
8

Original Image 2:

Program 2:

php

<?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);

$matrix = $im->queryFontMetrics($draw, $string);
$draw->annotation(0, 40, $string);
$im->newImage($matrix['textWidth'], $matrix['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>";
?>

Output:

8
8
8
16
8

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