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You should always design in ps at 200-300dpi. You can print to your printer at 720dpi or 1440dpi. You can use 55lpi halftones for 300 mesh.
Dont confuse lpi with dpi, they are not the same thing. It can be confusing.
okay thanks, but why when I print the image off photoshop it turms out smaller than what I want, it says image size is 13x17? How can I make it print 13x17
Quick question on dpi and mesh count? 
