That is not what I am asking.  The ink comes out of its cartridge via an 
aperture opening.  The size of the aperture is going to be either designed in 
inches or millimeters.  Which? The dot that is formed on the paper from the ink 
mist will also be in inches or millimeters.

Jerry

 




________________________________
From: Stephen Humphreys <[email protected]>
To: U.S. Metric Association <[email protected]>
Sent: Sunday, March 15, 2009 4:10:34 PM
Subject: [USMA:43914] Re: Tyre (tire) sizes

They use DPI

________________________________
Date: Sun, 15 Mar 2009 08:00:19 -0700
From: [email protected]
Subject: [USMA:43880] Re: Tyre (tire) sizes
To: [email protected]


Strange how plotters and printers are not on the same page.  I remember the old 
ink plotters that had pen widths in millimeters.  One size was 0.35 mm.  Even 
mechanical pencils have their lead sized in rounded metric.  Always was that 
way.  

With laser and ink jet printers common, one would think the dot size would be 
naturally be in millimeters.  Isn't it?

Jerry




________________________________
From: Pierre Abbat <[email protected]>
To: U.S. Metric Association <[email protected]>
Sent: Sunday, March 15, 2009 1:53:04 AM
Subject: [USMA:43868] Re: Tyre (tire) sizes


On Saturday 14 March 2009 12:38:19 Jeremiah MacGregor wrote:
> These all seem to be instances where a name is used but nothing is actually
> measured.  How do you measure your dpi?  How often do people use dpi when
> printing.  I never do.  I may choose font size, but these are just numbers
> that really have no unit attached.  

The way to metricate dot size in printers is to set it to a multiple or 
submultiple of 25 µm, which is used in plotters. PostScript doesn't care; you 
can set the font size to 2.718281828 points and scale the image by 
1.618034/0.70710678.

Pierre



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