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About Bob Todrick
Expertise
I can answer questions on most areas of photography. Though fine-art nudes is my main focus, I can, as well answer most questions dealing with darkroom processes (including many alternative processes).
My expertise does not include digital.
Experience
I have photographed since 1975. Among my clients have been a number of major retail department stores (the Bay, Eatons). I photographed for Canada's premier motorsports magazine for a number of years, and have done much portraiture and wedding photography.
In 1990 I gave up shooting professionally to concentrate on my fine-art work and have had numerous group and one person shows since.
Organizations
Co-founder of the Group of Several.
Publications
Numerous newspaper and print ads.
GRAPHIS photo annual.
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You are here: Experts > Arts/Humanities > Visual Arts > Photography > scanning
Expert: Bob Todrick
Date: 1/1/2005
Subject: scanning
Question
Im scanning a bunch of old pictures.What dpi would you rec'd?Ive been using 150,but am concerned I should up it to 300 or so.Thanks Bob
Answer
It is generally conceded that to obtain 'photo quality' reproduction you need to scan at a minimum 300dpi.
Here is the reason I say minimum. You must also output at 300 dpi to get a print that would be photo quality. If you scan a 5X7 print at 300dpi, and then print out a 5X7 everything works fine...but if you decide you want an 8X10 print, then you have problems. By doubling the print size, you also halve the scanned resolution, Your 8X10 out put is in the neighborhood of 150dpi (it will definitely have a 'digital look' to it.
So, for example, if you scan a 5X7 print with the idea of making 8X10 or larger prints then you would need to scan the original (5X7) at a minimum of 600dpi.
This is why neg scanners all scan at 4000dpi, because by the time you enlarge the scan from a neg sized original to, say an 8X10, you must scan at 1000's of dpi to get you final output of 300dpi.
Hope this helps.
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