Duck-type PImage so cross-processing-instance PImage instances match.
Duck-type PImage so cross-processing-instance PImage instances match.

baiyanghese/processing-js,jeresig/processing-js,guazipi/processing-js,baiyanghese/processing-js,jaredly/processing-js,kevinb7/processing-js,kevinb7/processing-js,guazipi/processing-js,jeresig/processing-js,jaredly/processing-js