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Card manufacturers often focus upon speed when pricing and marketing their products and, for some photographers, the data read and write speeds are important performance characteristics.

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The term 'aliasing' is a general term applied to signal processing. It refers to an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled. In imaging, it's often observed as 'jaggies', which appear as steps along what should be a continuous line or edge. These are caused by pixel structure. Aliasing can also produce moire, when fine lines appear to ripple due to the interference.

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In 2012, in Australia and all over the world, the bottom fell out of the compact camera business, with sales dropping in volume terms by up to 50 percent.

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This article will concentrate on scanners for digitising photographs and look at two types: flatbed and film.

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