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Old 09-19-2006, 11:23 AM   #1
readville
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Default Balancing scan size/resolution

I've got a project where I have to scan 100 8x10 B&W photos for printing @(8x10), burn them on CDs, and send them to a print shop. I know scanning should be @ 300dpi but the file size I'm getting is HUGE(750k).


My question is how much can I can compress the file and still get a high rez print? What should I be targeting as an ideal file size? Thanks. Vincent
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Old 09-19-2006, 12:07 PM   #2
don Arnoldy
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I know scanning should be @ 300dpi
What are these images going to be used for? How are they going to be output? I suspect that you don't need to scan at 300dpi--that is usually a safe resolution, but almost never the best resolution.

In what format are you saving them--some offer better compression that others, without quality loss?

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Old 09-19-2006, 12:17 PM   #3
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Don,

These historical photos are simply going to be printed/bound together at a copy shop, using the best quality paper, and will end up sitting in a business park real estate office for prospective tenants to thumb through.

I was thinking initially jpg over tiff due to file size.

Vincent
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Old 09-19-2006, 12:32 PM   #4
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These historical photos are simply going to be printed/bound together at a copy shop, using the best quality paper, and will end up sitting in a business park real estate office for prospective tenants to thumb through.

I was thinking initially jpg over tiff due to file size.
Basically laser-printed, you mean? You can reduce the resolution quite a bit. And you can test on your own laser printer to see how far you dare go. (If possible, get some of the actual paper for testing purposes.)

For newsprint you would need an LPI of 90 or less (needing a scanning res of 125 or so). These could possibly be lower than that.

   
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Old 09-19-2006, 01:31 PM   #5
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I would scan one at 300 dtp, med JPEG it send it to the copy shop and see what its likes - it takes all the debate out of it
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Old 09-19-2006, 01:35 PM   #6
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A bunch of test scans at varying compressions seems like the right approach......thanks for all the responses!

Vincent
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Old 09-19-2006, 01:40 PM   #7
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These historical photos are simply going to be printed/bound together at a copy shop
okay...
Then you shouldn't need any more than 150 dpi--this will make the files 1/4 the size that they are at 300 dpi.

I would use .tiff compressed, rather than jpeg--the lzw compression is lossless.

Peter's suggestion of testing is always a good one.

   
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Old 09-20-2006, 02:04 PM   #8
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A bunch of test scans at varying compressions seems like the right approach......thanks for all the responses!Vincent
Some of us lurkers are curious. Come back and let us know how it works out.
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