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fbeltramini, Computer science engineer
Category: Computer Hardware
Satisfied Customers: 52
Experience:  Master in computer science engineering
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What is the max DPI a scanner can obtain from a 4x6 and 5x7

Customer Question

What is the max DPI a scanner can obtain from a 4x6 and 5x7 digitally printed photo?
Submitted: 1 year ago.
Category: Computer Hardware
Expert:  fbeltramini replied 1 year ago.

Hello.

The max DPI that the scanner can obtain from a digitally printed photo is the DPI at which the picture has been printed. Scanning with a DPI value higher than this will not result in an improvement of the picture quality.

In any case if you don't know the DPI resolution of your printed picture you can follow these simple rules to obtain a good scanning.

Consider the dimension of the picture that you need to print (after scanning), let's say 5x7. Usually 300dpi for a printed picture is considered good quality.

Multiply 7 times 300 = 2100. Divide by 6 (height of your orignal picture) and you get the scanning resolution 350dpi.

For the secondo picture:

If you consider to print it in the same format 5x7,

Multiply 7 times 300 = 2100. Divide by 7 (height of your orignal picture) and you get the scanning resolution 300dpi.

Hope this is clear enough

Fabio

Customer: replied 1 year ago.
The height of your first example is 7 or 5, not 6 right? Or have I missed something regarding the number 6 playing a part with the 5x7?Also, let's say a scanner can scan at 4800 DPI Max while 300 DPI is fairly good for a 4x6 but scanning at 4800 DPI that's nearly 260MB per photo. If you were scanning photos for a photo slideshow presentation on a typical 40-60" screen or projection, what would be the top of the line scanning DPI choice for 4x6 and 5x7 photos without going the extreme at max 4800 DPI?