Ok..ive taken a sample off pages from this link
http://www.newsarama.com/dcnew/Dec07/previews/12th.html shrunk them down to 12x16cm and greyscaled them and they look readable for sure. Whether or not reading them in pdf format compared to just looking at jpegs makes a difference i do not know (also i had the resolution at 100 pixels/inch as that way it actually matched the actual size of 12x16).
Thanks for everyones help and again if anyone has any personal experience or can point me in the right direction that would be great.