PHP | Imagick orderedPosterizeImage() Function

The Imagick::orderedPosterizeImage() function is an inbuilt function in PHP which is used to performs an ordered dither based on a number of pre-defined dithering threshold maps, but over multiple intensity levels, which can be different for different channels, according to the input arguments. 

Syntax:

bool Imagick::orderedPosterizeImage( $threshold_map, $channel )

Parameters: This function accepts two parameters as mentioned above and described below:

• $threshold_map: This parameter is used to containing the string name of the threshold dither map to use.
• $channel: This parameter provides the channel constant that is valid for channel mode. More than one channel can be combined using bitwise operator. The defaults channel in Imagick function is Imagick::CHANNEL_DEFAULT.

Return Value: This function returns True on success. 

Errors/Exceptions: This function throws ImagickException on error. 

Below program illustrates the Imagick::orderedPosterizeImage() function in PHP: 

Program:

php

?php

// Create an Imagick object
$imagick = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png');

// Use orderedPosterizeImage function
$imagick->orderedPosterizeImage('o8x8, 3, 3');

// Set image format
$imagick->setImageFormat('png');

header("Content-Type: image/png");

// Display the output image
echo $imagick->getImageBlob();
?>

Output:

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