The mains scanner producer of the world will not all produce the scanner of 300600 dpies at present, This means that this grade products will be eliminated soon. 600120 dpies have already become news standard of the trade, because the products of higher resolution ratio have been affected by technology and production cost, Can not make a reduction by a large margin shortly. The scanners range of application of 600120 dpies are relatively wide, contain a lot of fields of printing from top-grade handling official business, webpage design to picture making, advertising intention etc. This kind of scanner has already become the main body on the market of the scanner. This kind of scanner, after using the high resolution ratio to scan picture, the user can still satisfy and export the precision request after enlarging the picture, This engaged in advertising pictures design and not large-scale to gush out and paint the personages of description come and say very much important to those. Are certainly all that grade of the scanners of 600120 dpies, 36 bits and scope of application difference are relatively big.