本白皮书对制作缩微品及数字式文件的三种不同的方法进行了比较。这三种方法是：（１）缩拍后扫描──普通的摄影视摄制出缩微品，然后用缩微品扫描器对已冲洗加工的缩微品进行数字化处理；（２）扫描同时缩拍──缩微品和数字式影像是在一台扫描缩拍两用机上同时生成的；（３）扫描后转成胶片──文件首先数字化，然后通过使用一台数字式胶片记录器来产生缩微品。 This white paper compares three different ways of making miniatures and digital files. These three methods are: (1) downscaling scanning - normal photographic filming produces a microform, then digitizing the microfilmed processed microfilm with a microform scanner; and (2) Microdisplays and digital images are generated simultaneously on a scanning retractable dual-purpose machine; (3) Converted to film after scanning ── The files are digitized first, and then the microfilm is produced by using a digital film recorder.