PHP | Imagick getImageChannelRange() Function

The Imagick::getImageChannelRange() function is an inbuilt function in PHP which is used to gets the range of channel.

Syntax:

array Imagick ::getImageChannelRange( $channel )

Parameters: This function accept single parameter $channel which specifies the channel to find image channel range. The default value of channel is Imagick::CHANNEL_DEFAULT.



Return Value: This function returns an array containing the minima and maxima of the required channel.

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

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

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<?php
  
// Create new Imagick object
$im = new Imagick(
  
// Using getImageChannelRange function
// with red channel
$res = $im->getImageChannelRange(imagick::CHANNEL_RED);
  
// Display result
print_r($res);
?>

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Output:

Array ( [minima] => 0 [maxima] => 65535 ) 

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

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<?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 getImageChannelRange function
// with red channel
$res = $im->getImageChannelRange(imagick::CHANNEL_GREEN);
  
// Display result
print_r($res);
?>

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Output:

Array ( [minima] => 32896 [maxima] => 65535 ) 

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



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