those lug nuts are just guessing. there's an actual formula to determine the proper dpi: 2 x lpi
lpi is not a typo or substitute for dpi. lpi is 'lines per inch' of your printer. don't bother looking for that info online or anywhere else because you'll never find it. but all consumer level ink jets are set at a standard 100 lpi. so following the formula you should set your dpi at 200. setting a higher dpi will result in greater sharpness but less tonal ranger. setting a lower dpi results in less sharpness but greater tonal range.
if you are scanning it gets a little more complicated but it sounds as if you are creating inside the computer. the links that soj_goj gave you are for scanning. not straight printing. for scans you simply multiply the 2 x lpi x (output size/input size) where output/input is a ratio. e.g. output=16x20 input=8x10. ratio=2/1 or just 2. so formula would be 2 x lpi x (2)=400dpi
p.s. if you happen to be using a laser jet they are set around 85 lpi. and if you are having your work professionally printed consut the print shop about their printer's lpi and go from there.What resolution should a digital painting (in dpi) be for printing?
300 dpi is probably the best. It depends on the size of the print as well. This is usually best for regular size prints and magazines, etc.
Some people go as far as 1200dpi or higher for large prints
Here are some guidelines:
http://www.chin.gc.ca/English/Digital_Content/Capture_Collections/Sub_sections/ex_media_types.html
http://www.rideau-info.com/photos/mythdpi.html
If I were you, I'd set it as high as it can go. The higher DPI will give you a better quality print. I recommend selecting a top-of-the-line scanner to digitize your analog art if you plan to go professional. I'd definitely stay above 600 dpi.
300 DPI will be good, but depends how much bigger you will like to print...because every DPI is good for some W x H.
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