最近時間分配好像好了一點，所以可以多點做自己的事。其中一件事就是完成zhrecode。 [more]

Films and Resolution

Normal 35mm film is of dimension 24mm x 36mm. The photo-sensitive chemical is distributed on the film in a resolution as high as 200 molecues/mm in the current technology. However, usually the printing from film uses only 40 lines/mm resolution and naked eyes cannot tell the difference. [more]