选用什么样的扫描仪 扫描就是把光信号转变为电信号,这个过程有两种方法来完成,一种是采用光电倍增管(PMT),一种是采用电荷耦合器件(CCD)。扫描仪有滚筒式和平板式两种。滚筒式扫描仪光源强度高,稳定性好,可以聚到很小的一个点上以获得高清晰度图像,放大倍率最高达30多倍。它的光电倍增管灵敏度强,识别密度可达4.0,与平板扫描仪相比,不仅仅在于只识别原稿最深 What kind of scanner is used to scan is the optical signal into electrical signals, this process has two ways to complete, one is the use of photomultiplier tube (PMT), one is the use of charge-coupled device (CCD). The scanner has two kinds of drum type and flat type. The high intensity and stability of the drum scanner light source can converge to a small point for high resolution images up to 30x magnification. Its photomultiplier tube sensitivity, recognition density of up to 4.0, compared with the flatbed scanner, not only to identify the deepest of the original