[XeTeX] Jagged Type in PDF
will at guerilla.net.au
Tue Nov 23 04:17:59 CET 2004
On 23 Nov 2004, at 1:22 PM, Bob Kerstetter wrote:
> Is jagged type in PDF the normal when anti-aliasing is turned off?
In a word: yes :)
In the "olden days", fonts came with bitmap screen counterparts for
rendering text on-screen. (This is still the case for Monaco, and a
couple of other old Mac fonts. Compare the differences in TextEdit
between Monaco at 9pt, 10pt, 11pt and 12pt...) This is generally no
longer the case, and Mac OS X uses anti-aliasing to approximate the
look of the font at these small sizes.
Without anti-aliasing, the screen output is essentially a
discretisation of the font at a very low resolution and the detail
suffers. Since the printed output uses the same font but at a much
higher resolution (300 or 600 dots per inch compared to an LCD's 100),
it looks a lot better on paper!
TeXShop always uses anti-aliasing, so the fonts are always smoothed to
look nice; as to the reason why you've never noticed it before, maybe
you just haven't turned off anti-aliasing in Preview.app before?
If you're interested, John Gruber has written some excellent articles
on anti-aliasing at
<http://daringfireball.net/2003/03/antiantialiasing> (and others) with
some nice examples.
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