igor@xBook:fast-neural-style[master]$ th fast_neural_style.lua   -model models/eccv16/starry_night.t7   -input_image images/content/chicago.jpg   -output_image out.png
Writing output image to out.png
libpng warning: Application built with libpng-1.4.12 but running with 1.6.26
/Users/igor/torch/install/bin/luajit: /Users/igor/torch/install/share/lua/5.1/image/init.lua:176: [write_png_file] png_create_write_struct failed
stack traceback:
	[C]: in function 'save'
	/Users/igor/torch/install/share/lua/5.1/image/init.lua:176: in function 'saver'
	/Users/igor/torch/install/share/lua/5.1/image/init.lua:442: in function 'save'
	fast_neural_style.lua:100: in function 'run_image'
	fast_neural_style.lua:119: in function 'main'
	fast_neural_style.lua:124: in main chunk
	[C]: in function 'dofile'
	...igor/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:145: in main chunk
	[C]: at 0x01074a9360