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赛璐珞胶片两面十分光滑，透明的一般为无色或呈浅黄、浅蓝，直接用笔写出的笔跡不易看清，必须将胶片打成毛面，才能使用，因此胶片打毛问题是决定采用胶片测图的首要关键问题。
The two sides of the celluloid film are very smooth and transparent, generally colorless or pale yellow and light blue. The pencils written by the pen are not easy to read. The film must be made into the matte side so that the film can be used. Therefore, The first key issue with film mapping.