How accurate are DPI ratings?

Joined
Sep 2, 2016
Messages
2
Hello all! This is my inaugural post here (-:

I cannot seem to find any definitive answers online regarding how accurate DPI ratings for printers are.

If my printer is 600(x600) DPI on b&w, am I correct in assuming:

25.4mm per inch
25.4mm/600dpi=.042mm

I created an image of [email protected] and attempted to print some .042mm lines. Upon inspection under my microscope, it was just a mess of splotches roughly resembling the overall shape of the intricate pattern I drew.

I suppose my question is:

How small can I print reliably at 600 DPI? What is the mathematical expression to determine this?

Thanks all!
 
Joined
Sep 2, 2016
Messages
2
Screen Shot 2016-09-01 at 9.18.22 PM.png
Screen Shot 2016-09-01 at 9.17.37 PM.png
 

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