It depends on the viewing distance. For very large prints, 150dpi is more than adequate. Which is why so many people can make the claim that their xxxx DSLR can make 24x30" (or even larger) prints -- from the proper distance they do indeed look great. Large Format purists might scoff at the above as a contact print has effectively infinite resolution.
J Michael Sullivan
Editor/Publisher, MAGNAchrom
www.magnachrom.com
MAGNAchrom -- The Alternative Journal of Medium and Large Format Photography
>-----Original Message-----
>From: ADavidhazy [mailto:andpph@xxxxxxx]
>Sent: Friday, August 17, 2007 03:22 PM
>To: 'List for Photo/Imaging Educators - Professionals - Students'
>Subject: Re: DPI and perception question
>
>Hi Per,
>
>Interesting ... interesting ... so this means one can't estimate how
>good a final print will be by an approximation provided by the CRT
>screen and one should just make sure to meet the printer's "rule" and
>that is it. That is no fun. Booo Hooo!
>
>oh, well ...
>
>andy
>
>
