On Jan 22, 2007, at 5:05 PM, Luis Finotti wrote:
I don't
quite understand the "dpi" option there... What does it refer to?
(dpi="dots per inch", right?
dpi = dots per inch. Think of it as the inverse or "inches per dot".
If a screen actually has 100 dots per inch, and the display software
knows that, and the display software does its job correctly (all big
"if"s!) that means that each dot is 1/100 of an inch across. So to
make a 12 point font (1 point = 1/72 inch) Your "m" will be 1/6th
inch or about 0.17 inch across, or 17 dots.
Under the same assumptions of everything working as it's supposed to,
if your screen has 72 dpi, the same 12 point "m" will be 12 dots
across, or (again) 1/6 inch.
Now if you actually have a 72dpi screen, but you tell the software
you have a 100 dpi screen, the resulting 17 dot wide character "m"
will actually be 17/72 inch, or about 0.24 inch across. Looked at
another way, the actual dots are bigger than the software thinks they
are, so the characters appear larger.
By claiming to have more dpi than you do, you will make your
displayed characters on the screen appear unnaturally large.
Does that help?
Rick
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