An uncropped 350D image is 3456px high x2304px wide (in portrait orientation), so you're at about 115dpi. That's low for a "normal" print, but not for a poster. You could resize upward to 150dpi, but it's not absolutely necessary. Many printers will handle the conversion pretty well on their own.
Remember that if you upsize, you won't get any greater detail, just a little smoother look, at the cost of a *lot* more data to be uploaded. There are as many ideas on optimal upsizing techniques as there are photographers, IMO.
In the end what you do depends on the printer you're using, and the end product. In this case it looks like you are wanting this to function as a poster, in which case I'd say "print it as it is" and don't worry about upsizing.
As Colette posted, you wouldn't be able to print from DPC Prints at less than 150dpi though. |
