----------------------------------------
> Date: Tue, 23 Feb 2010 09:26:10 +0100
> From: i...@1t3xt.info
> To: itext-questions@lists.sourceforge.net
> Subject: Re: [iText-questions] Retrieve Fonts from an existing PDF?
>
> Nirmal Fernando wrote:
>> How can I retrieve Fonts of an existing PDF? Is there a way in iText to
>> read the fonts embedded and replace them with a different type of font??
>
> This isn't necessarily impossible, but in most cases it's very difficult
> and in some cases it's very unwise.
>
> For instance: what if only a subset of the font is present in the PDF?
> Then you'll never be able to retrieve the full font, and will you
> replace this subset with a full font or a corresponding subset?
>
> Do you know anything about encoding? Do you know anything about CMaps?
> Do you know anything about the differences in metrics?
>
> For instance: the width of the words "Foobar Film Festival" is 178.74 pt
> in Helvetica, but only 157.90 in Times-Roman for the same font size
> (12). In other words: if you replace Helvetica with Times-Roman, you'll
> screw up your entire layout. Remember that PDF is NOT a Word processing
> format; every glyph is positioned at a predictable location. If you want
> to change the font, you need to do the layout all over again. That is:
> recreate the PDF from scratch.
I guess I'd just ask how hard it would have been for original author to
include enough information, either with standard or an agreed upon
private convention, to the OP to do any required re-layout? That is,
what would be involved in creating the original pdf with enough logical
structure to make it likely you could accomodate a font change ( or
just extract the words that are often the only thing people care about,
not fonts and columns etc)?
This is just a variant of my recurring rant ( we want information not
pictures in many cases to feed other computer programs ) to which you
contribute a good
point- fonts are complicated and human readability ads a lot of stuff.
A human audience of course is perfectly valid and there is nothing wrong with
using graphics to make it easier for the reader. However, having a short
tractable alphabet, rather than
say words composed of unordered and unbounded collection of things,
or even 24-bit color pictures, is
a big asset in organizing information- once you start adding stuff it can
be confusing unless you take some care to separate the information from artwork.
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