In fact, he got a lot of practice drawing, since enlarging equipment was unavailable at the time and enlargements had to be traced by hand to scale.
當時，所用的照像底片是三吋或五吋大的伊爾富 ILFORD，沒有放大機，只能做直接印片；如果要做大，只能用比例尺臨描放大，再細細描繪成像，這叫做「畫像」。