Last year a local newspaper wanted to use some images so I pointed them to my flickr account and told them to chose what they wanted and I'd let them have the hirez files. They responded that the 1200px images on flickr were perfectly good enough for them to print.
ImageKind produce Art Quality prints from your digital files. I'll let them speak about DPI PPI, and what modern printing techniques paper and ink can do.
Quote:
Don't confuse DPI with PPI! These two terms are often used interchangeably, although they refer to different things.
DPI (Dots per Inch) refers to how many drops of ink per square inch are used on paper to print an image. Imagekind prints our fine art giclees at 1440 DPI, which is one reason why they look so great. DPI has nothing to do with your file.
PPI (Pixels per Inch) refers to the number of pieces of information that are present in one inch of your image file at the selected print size. Otherwise known as output resolution, optimum results for our printing process require anywhere from 150 PPI to 300 PPI although we are still able to get good results all the way down to 100 PPI. This is our baseline output resolution and as such our system will not allow the purchase at any size that would result in a print using less than 100 PPI.
http://www.imagekind.com/printing.aspx
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