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.
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 then 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: