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Scanning Resolution

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  #1  
Old 10-23-2001, 09:16 AM
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Scanning Resolution

Need some help with scanning resolution. I'm using an HP 5470, and printing on an Epson 1280. I want to scan an old photo - about 2x3, and print it as a 5x7. What resolution do I need to set the scanner to? Thanks.

Larry
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Old 10-23-2001, 09:42 AM
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Larry,

I would suggest scanning it at a resolution of 600 if you have an *optical* resolution high enough. Do not use interpolated resolution, as you don't gain any *real* information. If you only have optical resolution of 300, use that. You might be satisfied with the results. Good luck.

Ed
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Old 10-23-2001, 09:43 AM
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Hi Larry,

You'll most likely want to print the final 5x7 at 300 dpi for the best quality, so work backwards from that final size to figure out what resolution to scan at. In actual pixels, that final size would be 1500x2100. To figure out the scan resolution, divide the original size into those numbers, i.e. 1500/2=750dpi and 2100/3=700dpi. Use the higher number - 750 dpi - to scan at. Then "resize" the image in Photoshop (or whatever image program you use) keeping the actual size in pixels, but changing the dpi to 300. That should give you at 5x7.5" image.

It may also be possible with the HP scanner to specify the final size (5x7") you want and let the scanner figure out the correct resolution. I think either will work.

Jeanie
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Old 10-23-2001, 09:46 AM
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What Ed said is true also. If your scanner's highest optical resolution is 600dpi, scan at that and then resize the image dpi to 240 - that should get you a 5x7 image. In most cases, the naked eye can't tell a difference between an image printed at 240 dpi vs 300 dpi.

Jeanie
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Old 10-23-2001, 09:58 AM
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Thanks all for the info. For Jeainie --- The Epson 1280 can print at 1440 and 2880 dpi. I was going to print at 1440 dpi. Should I do the math using that number, or is 300 dpi just the same?

Larry
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Old 10-23-2001, 10:05 AM
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Larry, I don't own the Epson, but what I've gathered from other people is that printing a 300dpi image on the Epson printer at 1440 produces outstanding results. You do not want to work with at 1440 dpi image - that would be a HUGE file and overkill. I think the difference here (and someone please correct me if I'm wrong) is that the printer resolution is actually "lpi" or "lines per inch" - which is the resolution it can put dots/lines down on the paper. Does that make sense? -Jeanie
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Old 10-23-2001, 10:11 AM
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Jeanie,

Forgive me for being so dumb but, I should set the scanner to scan at 300 dpi as opposed to 800 or 1200 say, and that would be quite sufficient.

Larry

PS.. I like the little thumbnails that appear under yours and others names. How do I go about adding one?
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Old 10-23-2001, 10:20 AM
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Hi Larry,

You're not being dumb. This is a confusing topic - esp. when I try to throw all these numbers at you and expect you to pick out what you need. (Just ask DJ how that worked for her. )

You'll need to scan at a higher resolution than 300dpi if you want the final image to be larger than your original. What you want is your FINAL image to be printed at 300dpi. You said that you wanted to enlarge a 2x3 to a 5x7. In that case, I would scan at 750 (or 800 if that's one of your choices). That will get you the actual pixel size you need to print a 5x7 at 300dpi. But, remember to then resize the image in Photoshop (or whatever program you use) to make it 5x7 at 300dpi - otherwise when you go to print it, you'll get a 2x3 image printed at 750dpi.

If I've confused you more, just say so and I'll try to start over.

Jeanie
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Old 10-23-2001, 10:23 AM
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Thumbnails aka avatars

The thumbnails under many of our names are called avatars. Some of us (like me) have created our own. Others have chosen one from a fairly large number of options. To set up one for yourself, click on the "user cp" tab up top, then click on the "edit options" button near the top of that page. At the very bottom of the "edit options" page, you'll see a section pertaining to your avatar. I think it's pretty straight forward from there. Let us know if you run into any difficulty.

Jeanie
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Old 10-23-2001, 10:23 AM
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Jeannie,

Understand. Thanks. I.ll let you know how it came out. I do use Photoshop by the way.

Larry
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