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05/29/2005 10:18:17 AM · #1 |
Hi
For the first time I got my negatives scanned. I had no idea how to go about it and lab that does it did at 72dpi. I had told them I want to create photographs of dimension of 8x10 size but when I opened scanned images, this is what I observed.
Size of image 1544 x 1024 pixel at 72 dpi , when I try to resize it to 8x 10 using dpchallenge’s tutorial I get following values 8 x 12.063 @ 128 dpi, hence now I have to interpolate it to 300 dpi and also say crop 12.063 to 10 .
My point is that when I get next negatives scanned at what dpi should I get them scanned so as to avoid interpolation altogether
Secondly in some rare cases where I have to crop a lot due to poor composition or the subject I need enlarge is small than what would be ideally setting to get it scanned at
As these snaps have been clicked a my cousin who portraits using auto focus camera and as result cause too much useless background , simply speaking awful composition and I simply cannot make enlargement with that composition
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05/29/2005 10:45:31 AM · #2 |
Sounds like they are used to scanning for folks who only want to print 4x6. They should re-do it for you. If the image came out at 1544px, they originally scanned at about 1100dpi. That's too low to capture all the detail in a 35mm negative. For your intended print size, they should scan at a minimum of 2400dpi. They probably have the capability to scan at up to 4000dpi.
Message edited by author 2005-05-29 10:45:58.
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05/29/2005 11:33:18 AM · #3 |
thanks alot for your feedback
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05/29/2005 11:43:04 AM · #4 |
Also, many places which scan for others charge by the ending file size.
For a 35mm neg you should end up with about 4096 x 2732 pixels or about a 32MB file -- that yields an image about 9 x 13.5 at 300 dpi.
As kirbic says, most transparency scanners (especially pro versions in a service bureau setting) should have an optical resolution of about 4000, and could give you a file about 50% bigger than that, if you want to pay for it. |
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05/29/2005 11:46:19 AM · #5 |
| You also might want to check out this thread on slide scanners. |
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05/29/2005 11:52:00 AM · #6 |
If you are going to interpolate, you will have to have dpi loss.. 150 dpi for the maximum printable size is generally accepted. I woudn't try to upscale from 128-300dpi that will give some bad results. I'd try to get a lab that will scan at 300 dpi or higher so that you can down size instead of upsize to regain clarity instead of lose it.
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05/29/2005 06:02:47 PM · #7 |
I think the moral of the story is get a film scanner and do it yourself, particularly if you plan to scan a lot of negatives and slides.
The feedback I get from most people who have anything done digitally by commercial photo labs is of general disappointment. Of course this is nothing new, most commercial labs never did a very good job processing and printing film either.
Have a look at what a film scanner can achieve: //www.schoolofphotography.com/if/infocus28.html |
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