Printing photos with 2 by 3 dimensions on A2, A3+, A3, and A4 formats with an equal border poses the problem that A-sized paper dimension does not respect the 2 by 3 dimensions of the average photo sensor.
Printing 2 by 3 dimensioned photos on A-sized paper with equal white space is easy to calculate. After some substitutions I found the following formula to calculate the optimal photo length: Photo Length= 2 * (Paper Length – Paper width). Applying this formula to different A-paper sizes gives the following results:
|Format||Width (mm)||Length (mm)||Width (mm)||Length (mm)||Border (mm)|