预打样是在制版过翟的最初阶段或者晒版之前,制作出仅供毛校或听取委托印刷单位意见用的彩色样张。由于这类打样不是在制版工作后进行,可以较早地发现制版作业阶段前的错误和不妥之处,又能较快地得到样张,从而使机械打样的返工率降低。这不仅有利于样张质量的改进,其经济效益也可明显提高。当然,预打样本身并不是代替机械 Pre-proofing is to produce a color proof for the sole use of Mao or to listen to the opinions of the printing unit before the initial stage of plate making or printing. Because this kind of proofing is not carried out after the platemaking work, it is possible to find the errors and irregularities before the platemaking stage earlier and to get the proofs faster so as to reduce the rework rate of the mechanical proofing. This is not only conducive to the improvement of sample quality, its economic benefits can be significantly improved. Of course, pre-proofing itself is not a substitute for machinery