self.SD.SetCapability(twain.CAP_DUPLEXENABLED, twain.TWTY_BOOL, 0) #单面扫描 self.SD.SetCapability(twain.CAP_DUPLEXENABLED, twain.TWTY_BOOL, 1)#双面扫描 self.SD.SetCapability(twain.ICAP_PIXELTYPE, twain.TWTY_UINT16, 0)#012:B/W 灰色 颜色,形成的图片体积越来越大 self.SD.SetCa