PHP | Imagick getImageChannelDepth() Function

The Imagick::getImageChannelDepth() function is an inbuilt function in PHP which is used to get the depth for channel image.

Syntax:

int Imagick::getImageChannelDepth( $channel )

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

Return Value: This function returns True on success.

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

Program 1:
Original Image:

<?php

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

// Using getImageChannelDepth function
// with different channel
echo $im->getImageChannelDepth(imagick::CHANNEL_RED) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_GRAY) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_CYAN) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_GREEN) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_BLUE) . "</br>";
?>

Output:

8
8
8
8
8

Program 2:
Original Image:

<?php

$string = "Computer Science portal for Geeks!";

// Creating new image of above String
// and add color
$im = new Imagick();
$draw = new ImagickDraw();

// Fill the color in image
$draw->setFillColor(new ImagickPixel('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 ImagickPixel('white'));
// Draw the image
$im->drawImage($draw);
$im->setImageFormat('jpeg');

// Using getImageChannelDepth function
// with different channel
echo $im->getImageChannelDepth(imagick::CHANNEL_RED) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_GRAY) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_CYAN) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_GREEN) . "</br>";
echo $im->getImageChannelDepth(imagick::CHANNEL_BLUE) . "</br>";
?>

Output:

8
8
8
16
8

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