load greyscale png images, refactor some code
load greyscale png images, refactor some code

factor/factor,sarvex/factor-lang,nicolas-p/factor,nicolas-p/factor,tgunr/factor,bpollack/factor,bjourne/factor,nicolas-p/factor,dch/factor,AlexIljin/factor,tgunr/factor,nicolas-p/factor,sarvex/factor-lang,nicolas-p/factor,bjourne/factor,bpollack/factor,bjourne/factor,nicolas-p/factor,factor/factor,factor/factor,dch/factor,sarvex/factor-lang,sarvex/factor-lang,dch/factor,tgunr/factor,bpollack/factor,mrjbq7/factor,bjourne/factor,dch/factor,bpollack/factor,AlexIljin/factor,mrjbq7/factor,bjourne/factor,dch/factor,slavapestov/factor,bjourne/factor,slavapestov/factor,bpollack/factor,mrjbq7/factor,mrjbq7/factor,sarvex/factor-lang,bpollack/factor,factor/factor,AlexIljin/factor,slavapestov/factor,slavapestov/factor,slavapestov/factor,dch/factor,mrjbq7/factor,sarvex/factor-lang,factor/factor,tgunr/factor,slavapestov/factor,AlexIljin/factor,tgunr/factor,sarvex/factor-lang,nicolas-p/factor,factor/factor,AlexIljin/factor,mrjbq7/factor,AlexIljin/factor,bpollack/factor,bjourne/factor,AlexIljin/factor,slavapestov/factor,tgunr/factor