Recommended file sizes:
(Images taken using mobile phones do not usually produce good results as they have very small lenses and although do sometimes produce large files, the end result is not suitable for printing)
Desktop Calendar 500kb+
Single page A4 Calendar 1mb+
Double A4 and A3 Calendar 2mb+
We would recommend a max size of 5mb as any more than this will not improve the quality of the end product.