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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.
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