Includes but doesn't always use. PNG also includes filters which can dramatically decrease sizes, especially when combined with compression.
That's why tools like OptiPng basically brute force all the combination of options. Depending on the image content different combinations of filters and compression will get the best file size.
That's why tools like OptiPng basically brute force all the combination of options. Depending on the image content different combinations of filters and compression will get the best file size.