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Bpete
Posts: 113
Joined: 12/3/2001
From: Fort Lauderdale Florida USA
Status: offline
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scanner 2400 x1200 ... which to use? - 1/23/2002 8:11:46
I can't seem to find a simple basic answer, help somebody ... help.
I want to scan an image at the max. optical resolution of the scanner. It's specs say it's 2400 x 1200. You can only set one number when deciding what res to scan to. So which one? It's a flat bed with ability to scan slides & negs and I'm doing 2 1/4 negs and transparencies so I need the max. resolution, but want to stay in the optical range not the interpolated.
Thanks Bpete
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mflynn
Posts: 32
From: West Grove PA USA
Status: offline
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RE: scanner 2400 x1200 ... which to use? - 1/23/2002 10:24:29
If you pick 2400 you will have interplation on one axis, either hieght or width. The scanner makes a square pixel so res 2400 is res 2400 x 2400. If you set 1200 you will have a 1200 x 1200 pixel with no interpolation. If you need the image size you might try the 2400 and see if the interpolation really hurts image clarity that much.
Usually graphics print professionally using a 150 dpi (dots per inch) screen which (at 2 pixels per dot)uses a resolution of 300 lpi (lines per inch. What is your final use for the picture? The web will display at 96 lpi on a PC and 72 lpi on a mac, and that display resolution isn't changeable.
Hope I haven't made that too complex?
Mark flynn<BR>mflynn@mineun.com<BR>www.mineun.com
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garyb
Posts: 208
From: North Clarendon Vermont USA
Status: offline
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RE: scanner 2400 x1200 ... which to use? - 1/23/2002 15:41:48
As Mark said, the driving question should be what are you going to use the image for. In many cases, the scanned size is overkill for what you will use it for.
Gary
Ready Page Graphic Design
www.ready-page.com
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PBailey
Posts: 907
From: San Antonio, Texas USA
Status: offline
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RE: scanner 2400 x1200 ... which to use? - 1/23/2002 17:45:31
Mark and Gary are probably much more knowledgable then I about this but in my own experience I have found getting a usable scan of a negative at 1200 to be nearly impossible. Slides seem to work at 1200. What you do with the picture in your image editing program after the scan can then make some difference.
Paula
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garyb
Posts: 208
From: North Clarendon Vermont USA
Status: offline
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RE: scanner 2400 x1200 ... which to use? - 1/24/2002 8:25:24
OF course, a lot depends upon the scanner. And, a lot of the flat bed scanners that will also do film, negatives, transparencies etc. really aren't very good at those things. I've got a slide/film scanner to handle those things because I've found they are so different that it was worth the expense for the number of them I ran into. But then again, I also do a lot of print work so hi resolution is important there.
Gary
Ready Page Graphic Design
www.ready-page.com
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Bpete
Posts: 113
Joined: 12/3/2001
From: Fort Lauderdale Florida USA
Status: offline
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RE: scanner 2400 x1200 ... which to use? - 1/24/2002 8:58:21
Thanks all,
Actually Mark had the answer that I was looking for, thanks Mark. I needed to calculate the scan for use with a laser light printer (photo process) with a target DPI value of 225.
Came out as follows:
2.25 x 1200= 2700 pixel divide by 225 = 12. Meaning I can target a 12"x12" print from the system and expect to get a good one. :)
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PBailey
Posts: 907
From: San Antonio, Texas USA
Status: offline
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RE: scanner 2400 x1200 ... which to use? - 1/24/2002 13:07:25
Garyb, That is true. If one is going to do a lot of slide/film scanning you need the right scanner. I was just going by Bpete's first post that he had a flatbed so assumed it to be a normal scanner.
The slide/film scanners keep coming down in price and that is good. I have a whole bunch of old family slides I need to preserve on CD.
Paula
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tarheel
Posts: 422
From: Fresno CA USA
Status: offline
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RE: scanner 2400 x1200 ... which to use? - 1/27/2002 3:53:35
I scan with a Nikon Coolscan 4000 at 1200 dpi and save at 6x4. Yes, my scans are huge, but I am scanning for print, and want the resolution.
When scanning for the web I scan at 600 dpi and save as tif file, and then manipulate my image, save the changes and then export as jpg at 400 horizontal dpi and post. Why so high resolution? I did many experiments at various resolutions and found that there is increased image quality with 600 dpi scanning.
See results here at http://yosemitefun.com/tarheel/images/pictures_of_yosemite.htm
Also, here's some food for thought at http://www.scantips.com/
Phil
"If God is not a Tar Heel, then why are hyperlinks default-colored Carolina blue?"
http://www.1awebhosting.com
1A Web Hosting for Frontpage.
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