newcomer scanner maths help

[faris]

i know that in a dslr if i have a 3000 by 2400 pixel image, i can print it ( as is ) to
a 10 by 8 inch size at 300 dpi.

i am now scanning cn41 bw film and would like to get a 10 by 8 inch print. what
dpi do i need to scan it at?

if my maths is off please correct me.

Best regards and thanks for your help.

 

[mfogiel]

You divide the negative size by inches and then you multiply by 300 and by your print size, so in case of a 24x36mm, the short side is slightly less than an inch, so let's say 1x300x8=2400, therefore you should scan at least at 2500ppi.

 

[faris]

mfogil, thanks for your quick response. got it!

i love your images and wish i could be half as good as you.
regards.

You divide the negative size by inches and then you multiply by 300 and by your print size, so in case of a 24x36mm, the short side is slightly less than an inch, so let's say 1x300x8=2400, therefore you should scan at least at 2500ppi.