At what size of print out of D700 will show the same quality as that of D600.

Started 9 months ago | Discussions thread
ranalli
Contributing MemberPosts: 968
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Re: At what size of print out of D700 will show the same quality as that of D600.
In reply to ebuddha, 9 months ago

ebuddha wrote:

great question - most people have way too much resolution for their needs.

a 30" monitor only requires a 4MB file to fill it up.
an ipad only requires 3MB.

Required print resolution is a function of viewing distance.
One thought is that comfortable viewing is 1.5x the diagonal.
Then, the PPI required for a print to have 'minimum acceptable quality' is found using this formula:
PPI = 3438 / viewing distance

As an example, an 8" x 10" print has a diagonal of 12.8"
and thus a viewing distance of 19.2"
The minimum PPI required would be: 179 - which is only a 2.6MB file.

Personally, I prefer using 1x the diagonal in the formula, which implies a minimum PPI for an 8x10 to be: 269. That would mean a 6MB file is sufficient.

As far as using the number 3438, you can look this up online, it has something to do with "visual acuity angle, a measure of how much resolution the human visual system can perceive"

Most people don't understand this concept at all.

I continually see a number of these people thinking they need FAR more MP than they really need.  You might think everyone here had their own wall-exhibit at the MOMA where people are going to be walking right up with their nose to your huge 10x20 foot printout and pixel peeping.

The reality is this: I'm printing a 50x70 inch canvas with a 12MP file originating from my D700...it will look fantastic from as little as two feet or more away which is the proper viewing distance.

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