Answering my own question; "3.3. Changing image parsing direction": http://caca.zoy.org/study/part3.html http://caca.zoy.org/study/part3.html The answer seems

Answering my own question; "3.3. Changing image parsing direction": http://caca.zoy.org/study/part3.html http://caca.zoy.org/study/part3.html The answer seems to be that changing the image parsing direction gets rid of some artifacts but introduces others while not vastly improving on faster and simpler approaches.