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Archive 2013 · Hi : ) !!! - How large is 300 dpi?
  
 
igmolinav
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p.1 #1 · p.1 #1 · Hi : ) !!! - How large is 300 dpi?



Hi,

I am using a film camera. I went to the lab and
they offer to scan the negatives up to 300 dpi

How large can one make a print at 300 dpi?

Thank you, kind regards,

igmolinav : ) !!!



Jan 27, 2013 at 12:05 PM
howardm4
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p.1 #2 · p.1 #2 · Hi : ) !!! - How large is 300 dpi?


not much. a 300DPI scan rate is really quite low (we'd suggest 300DPI as *print* size) and you want soemthing like 200-300 DPI on the finished print (less if the print is larger but you're in a catch-22 here).

Are you sure they didn't say 3000DPI is the input scanning rate?



Jan 27, 2013 at 02:25 PM
Bifurcator
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p.1 #3 · p.1 #3 · Hi : ) !!! - How large is 300 dpi?


Yeah, 3,000 to 4,000 is what you want.

300 dpi is dang near a thumbnail.




Jan 27, 2013 at 04:46 PM
Older Fossil
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p.1 #4 · p.1 #4 · Hi : ) !!! - How large is 300 dpi?


Several years ago I acquired a used Minolta DiMAGE Scan Elite 5400 for scanning slides. This scanner can scan slides or 35mm negatives at 5400 ppi. A 300 ppi scan of a negative would only allow a contact print size or slightly larger.

Art



Jan 27, 2013 at 05:34 PM
WAYCOOL
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p.1 #5 · p.1 #5 · Hi : ) !!! - How large is 300 dpi?


283x425 pixels printed at a marginal @150ppi would make a print a little less than 3x2 inches. Just a little bit too small to hang on the wall.


Jan 27, 2013 at 05:53 PM
 

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igmolinav
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p.1 #6 · p.1 #6 · Hi : ) !!! - How large is 300 dpi?


Hi,

Thank you for your messages : ) !!!

I will ask the man tomorrow again. He may have meant 300 ppi on paper!
That may be enough to print a picture sized 6x4 inches

Kind regards,

igmolinav : ) !!!



Jan 27, 2013 at 07:43 PM
Bifurcator
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p.1 #7 · p.1 #7 · Hi : ) !!! - How large is 300 dpi?


I bet he meant 300 DPI just like you heard - and the service is for digital contact or proof-sheeting the images. I almost fell victim to this as well. For $1.50 extra my printshop will digitize the images for me. And the result is about 800x600 which is about what your guy is quoting too. For $10 more however I can specify the scan resolution all the way up to 4,800 DPI.


Jan 28, 2013 at 09:11 AM
RustyBug
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p.1 #8 · p.1 #8 · Hi : ) !!! - How large is 300 dpi?


IF ... he is talking about a scan rate of 300 ppi for film then your numbers go something like this:

Film area = 24mm x 36mm, converted to inches @ 25.4mm/in = .9448in x 1.4173in
(24/25.4 & 36/25.4)

Scanning @300 ppi would yield an image 283 x 425 pixels as noted by WAYCOOL.
(.9448*300 & 1.417*300)

Taking the 283 x 425 pixel image and printing it @ 300 dpi (same 300/in as scanned) would yield a print size of .9448in x 1.417in the same size as the negative, i.e. a contact print.
(283/300 & 425/300)

Printing @ at the lower 150dpi would then yield a larger print of 1.9in x 2.8in as WAYCOOL points out.
(283/150 & 425/300)

Printing @ an even lower 100dpi would yield a print size of 2.83in x 4.25in
(283/100 & 425/100)


However, (as noted by others) ... IF he is talking about 300dpi for printing, then we really have no way of knowing what scan rate is being used to produce the file. Once we know the scan rate, then we can apply that number to our negative size to determine our file dimensions.
(.9448 * scan rate & 1.417 * scan rate)
After which we can divide the file diminension by our desired print dpi.

My guess is that he meant that after the print was scanned (rate unspecified), the file would then be printed @ 300dpi. Without knowing BOTH the scan rate AND the dpi being printed at, it is not really possible to know how large a print can be made (not to mention the viewing distance of the print in application) from a scan.

BIF brings out a point that a proof sheet may very well be a 300 ppi scan rate, but if the tone of the discussion was about quality (vs. convenience of a proof sheet), it would be difficult to imagine that he meant a 300 ppi scan rate, but rather a 300 dpi printing from the resultant file produced by the scan (rate unspecified).



Jan 28, 2013 at 01:17 PM
cgardner
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p.1 #9 · p.1 #9 · Hi : ) !!! - How large is 300 dpi?


Either the lab you talked to doesn't communicate very well or perhaps you didn't understand what they told you.

I suspect they might have said the scans will allow you to create a X by Y inch print @ 300ppi resolution.

For example @ 300 ppi a 2400 x 3000 pixel file will produce an 8 x 10 print. A 4800 x 6000 pixel file will produce a 16 x 20 print.

What you need to know is how big in pixels the scanned file will be. Then divide those numbers by 300 and it will tell you the size print you can make without any resizing in Photoshop.

With up-sampling and some loss of IQ you can make prints up to 150% of that size.



Jan 28, 2013 at 07:24 PM





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