Although many scanner manufacturers claim that they have most powerful scanner that offers highest resolution, it is said that highest resolution is limited to only 600 spots per linear inch. There’s a way in proving this theory. Think of scanning a 600x1200 dpi. If measurement is based on X and Y (horizontal and vertical) of square inch, output would either be a series of squares with some blank spots, or a square with overlapping spots. For non-uniform resolution such as these, scanners perform interpolation. Interpolation is a process whereby a software or firmware is needed to produce an extra pixel by sampling two pixels.

Grey-scale scanners and color scanners are different from flatbed scanners. They all contain CCDs, but CCDs in grey-scale and color scanners can differentiate between levels of light falling on them.

The bottom line here is that why do we have to consume a large amount of our computer’s memory if we can have exact number of pixels without compromising quality. Not only that, we can also minimize time spent for interpreting data including those that we do not use.

4. Product Quality and Payment Terms. The rule here is simple. Do not make final payment to your Chinese manufacturer until you are confident you will be getting an on time shipment of correct items and quantities at quality standards you require. This usually means you must incur inspection costs in China and provide for a clear procedure for dealing with these problems as they arise. You must take lead on this. You cannot depend on OEM manufacturer to do this for you.

5. Use comprehensive OEM Agreements with each manufacturer. Small and medium sized businesses often enter into OEM manufacturing transactions with a simple purchase order. This is a mistake. The purchase order will protect Chinese manufacturer, not you. Your protection depends on your securing a written OEM manufacturing agreement with each Chinese manufacturer with which you deal. The ideal OEM agreement will address all of issues discussed above while also addressing other basic legal issues such as jurisdiction and dispute resolution. This agreement should be in both Chinese and English, since Chinese language version will control in China.