On Aug 15, 2008, at 6:57 AM, Oliver Schoenwald wrote:
>> Leonard Rosenthol wrote:
>>> Be aware that relying on a font already embedded in the document
>>> to then add additional content is NOT a good idea - since you have
>>> no guarantee that the font was fully embedded OR even embedded
>>> properly.
> I was successful in registering an using the additional font in the
> document. When you say that embedded fonts might not be embedded
> properly in the document, do you mean that the fonts is not embedded
> completely but only with the necessary chars/glyphs?
There are two issues that play here when it comes to trying to use an
existing embedded font to add new content...
1) Does the font have all the necessary glyphs present?
2) Does the font have all the necessary "layout tables" for doing
proper text layout?
The first is usually (but NOT always) easy to determine by seeing if
it is "fully embedded" or "subset embedded" - however, as there are
many bogus PDF generators in existence it is not uncommon to find a
font that is improperly "tagged" incorrectly and so it's difficult to
know (without examining every glyph) what you have (and don't have).
The second issue is related to the fact that even for full embedding,
it is not necessary for a PDF creator to include the font information
for "layout" (kerning, tracking, leading, etc.) that is required when
trying to layout/flow new content. Again, there is no easy way to
know this - and you (or software) would have to examine the various
tables in the font to know what's there or not.
Leonard
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