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dpi vs ISO in filmscan

A

Anonymous

Guest
Hello,
i am looking for a film scanner, since i do my photoes on color negatives and slides. In every specification of a film scanner i can find the dpi values and the color depth, but i cant find how much does it really mean.
What i want to ask is: how much dpi do i need to perfectly scan an ISO 100 film and how much color depth do i need if i want to scan a normal kind of film.
Thank you,
Andrej
 
Hi Andrej:
I am not an expert, but here is my understanding of "dpi" or dots per inch. A color monitor has 72dpi, so scanning at 144 dpi will produce an image 4 x larger on the monitor ( 72 x 72 = 1 sq inch, 144 x 144 = 4 sq inch). If your image is for posting on the web, set the scanner for 72dpi. Or go higher if you want to enlarge and crop a part of your image.
Most digital camera experts recommend 300dpi for photo printing. This produces a very large image on the monitor, but it is necissary for printing a high resolution print.
As to color depth, I am not familiar with this term. If you are using an Apple Macintosh, it comes with a program for calibrating the color from the scanner, to the monitor, to the printer, so that everything matches. Of course if you use Adobe Photoshop LE, you can control all these variables. I am sure that there are similar applications on the Windows PC.
As I said, I'm no expert, and maybe someone else can add more to the discussion. But technical help on this forum is usually not forth coming. I don't know why. You might learn more by checking out these websites:
http://www.dpreview.com/
http://www.imaging-resource.com/
Good Luck
fod:)
 
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