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| Gen 393th Post
 
Silver Customer
  
    
|  "Re(2):O.T. Technical question about scanner h"
, posted Sun 14 Jul 00:00:
quote:
HW as in "home work"?
C'mon, it is *your* homework afterall. If you invest some time making intelligent web searches I am sure you will find a web page that gives a good enough explanation.
Nah, I meant hard ware but couldn't fit it. If it was home work I wouldn't try to get other people to do my home work for me while hiding that it was home work. I asked here because maybe someone here knows something about scanners might know this. And through the magic of BBSes someone could type the answer in a few minutes where as it might take me a long time searching for the answer.
To me, un-matching dpis wouldn't give the best information.
To explain what I mean: I'm not talking about the dots of the entire scanning area (like 8.5 by 11 inches), but about the dots horizontally and vertically in each square inch.
When I see something like 600x1200 dpi, I believe it means the up and down dots per inch are different than the right and left dots per inch. (If this assumption is not right then my questions answered.)
Think of if every two pixels on your monitor horizontally were joined into one, but the resolution was the same vertically. Wouldn't it be better to have an even grid of pixels?
I've contacted about 5 companies that sell scanners. One person from one of them suggested it helped something with scaling, as he had heard it explained to him, but that didn't sound right.
The only reason I can think of is, if for some reason in the early days of scanners it made more sense to have more dots per square inch one way than the other for the purpose of scanning simple text, and then the tradition was carried on.
Let me type some more details:
I'm looking to buy a scanner very soon. Probably early next week. I was shooting for one with a large scanning area like 11x17 inches, but of the few scanners that are up to that size, all are either very expensive, or had disproportioned dpi, or relatively small dpi, or were thousands of dollars.
Microtek had some good looking scanners that were in a more reasonable price range and were up to the specs except for the dpi.
Currently I'm looking at getting a Hewlett Packard scanjet 7400c because it has 2400x2400 dpi and scans legal size documents (8.5 x 14 in.) - most scanners only do 8.5 x 11 inches. It is the current best match.
So my question about the dpi being different horizontally and vertically in each inch may be philosophical and idealistic. If I were to find out that there is no technical superiority to matching D.P.I.s then I would probably get the Microtek one, which has the larger scanning area.
The reason I wanted the large area was so I could scan large things, such as large magazines or two facing magazines pages in one scan, comics, large pictures, etc.
For the benefit of others I could scan stuff out of Arcadia magazine...
((I usually like to type 'short cut' posts that just get to the point. And if something needs more explaining then type another post. I figure most people will get what I mean, and I do this to avoid typing an essay. But maybe it would be better to sometimes make clearer and larger posts when with more use of complete sentences.)) 
[this message was edited by Gen on Sun 14 Jul 00:08] |
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"O.T. Technical question about scanner hw" 