How does viewing distance affect print resolution?
As viewing distance increases, the eye resolves less fine detail on the print, so very large work often does not need the same PPI as a small photograph viewed up close.
Use the numbers from your actual job
The guide explains the decision; the linked calculator gives you the value for your own file or production assumptions.
Check the source pixels and final physical size
Resolution decisions should start with the actual pixel dimensions, the intended physical output and the target or provider-specified PPI. Metadata labels alone do not add or remove source pixels.
Apply the answer to this specific question
As viewing distance increases, the eye resolves less fine detail on the print, so very large work often does not need the same PPI as a small photograph viewed up close. The practical consequence should be checked with Viewing Distance Resolution Planner when your own dimensions, page count, cost or production values differ from the example implied by the question.
What commonly changes the result
For “How does viewing distance affect print resolution?”, the most important variables are the ones represented by the linked calculator and any provider-controlled specification. A correct arithmetic result can still be unsuitable if the source dimensions, category, page yield, trim, bleed, margin or production method were assumed incorrectly.
A better verification workflow
For How does viewing distance affect print resolution?, record the source measurement or controlling specification first, then run the real job values through viewing distance resolution. Keep the result with the job notes, compare it with the physical file or material, and recheck any provider-controlled rule immediately before production or upload.
Practical answer
As viewing distance increases, the eye resolves less fine detail on the print, so very large work often does not need the same PPI as a small photograph viewed up close.
When the decision affects a paid print run, book upload, client order or expensive material, keep the calculation with the job notes and verify any external specification again immediately before production.