Printer dpi confusion

  Stevie D 12:15 08 Dec 03

I'm looking at buying a new printer and I am a bit confused by the resolution stated in the magazines.

Some say things like 4800 dpi while others say 4800 x 1200 and others 1200 x 1200.

I know dpi stands for dots per inch and I take it that dots per inch are the number of dots per inch on one line. Can any one please explain why some adverts only give one dpi figure. My guess would be that adverts that give 2 figures for dpi are outlining the dpi in both the height and width of a square inch, but if this is true, why are the dpi the same for both the height and the width for some printers but different for others?

  AndyJ 13:41 08 Dec 03

Printers have two types of resolution - Vertical reolution and Horizontal resolution; so in those descriptions which have the two figures e.g. 4800 x 1200 , the vertical resolution is given first (4800) and horizontal second (1200). For better printouts it is vertical resolution that is more important.

I suspect that when only one figure is given e.g. 4800, then either the horizontal and vertical reolution are identical (4800 x 4800) or they only feel it necessary to supply the vertical (better) resolution.

In the case of them displaying both the same e.g. 1200 x 1200 then either they're just being accurate or they also make printers that have non-matched resolution e.g. 2400 x 1200

  hugh-265156 13:45 08 Dec 03

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