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I used to work at a large billboard/POP company. we required 300 ppi at a scaled down verison, if I remember the ratio correctly it was 1100%. we did the scaling first on a copy dot type of camera before CTP came about, and later on scaling it on final output to the platesetter. the final DPI for the billboards was 15dpi for offset work, 8-10dpi for silkscreen.
man, never thought i would need to remember THAT bit of information lol.
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Note to self: \"Never argue with idiots; they\'ll drag you down to their level and beat you with experience\"
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