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TTX "improving" a font

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TheFontGuy

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Jun 18, 2009, 2:09:47 PM6/18/09
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I've tried running a few fonts through TTX and back and have noticed a
few puzzling changes:


(1) All the glyph bounding boxes get recalculated, often to 15% to
25% smaller than original.

(2) The numberOfHMetrics value in one font got changed from 141 to
140.


The questions are:

(1) Can shrinking the bounding boxes cause any compatibility problems
with old apps that may have been fine-tuned to use the older, sloppier
boxes?

(2) Any idea why TTX would compute a different number of Glyphs than
in the original TT font file?

Any answers appreciated.

Regards,

George

JosephKK

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Jul 12, 2009, 11:12:01 PM7/12/09
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Not that i know jack all about the subject, but:

(1) you might see a greater average number of words per line if the
bounding boxes shrink.

(2) i suppose that it is possible that it could "merge" two blank
glyphs. I have seen more than one case where there are multiple
glyphs for many given codons. Thus, in principle, i do not recommend
any program merging glyphs for different codons, the program may
mistake different space containing glyphs for non-space containing
glyphs.

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