Text in PDF files sometimes contains embedded fonts. If you experience difficulties filtering embedded fonts, there are options in the API, the formats.ini
file, and the filter sample program that enable you to skip this type of text.
If you skip embedded fonts, none of the content that contains embedded fonts is included in the output.
When you use formats.ini
to skip embedded fonts, you can also specify an embedded font threshold, which is an arbitrary percentage probability that the glyph in the embedded text maps to a character value in the output character set (ASCII, UTF-8, and so on).
For example, if you specify a threshold of 75
, embedded text glyphs that have a 75% or greater probability of correctly matching the character in the output character set are included in the output; glyphs that have a probability of less than 75% of matching the output character set are omitted from the output.
To skip embedded fonts by using the formats.ini file
Set the following parameters:
[pdf_flags] skipembeddedfont=TRUE
embedded_font_threshold=threshold
where threshold
is a value between 0
and 100
. A threshold of 100
skips all embedded font text; a threshold of 0
retains all embedded font text. Set skipembeddedfont
to TRUE
to enable the embedded_font_threshold
parameter.
The default value of embedded_font_threshold
is 100
. if you set skipembeddedfont
to TRUE
and do not specify the embedded_font_threshold
parameter, Filter skips all embedded text.
To skip embedded fonts by using the
C++ API, invoke skip_embedded_fonts(true)
on a Configuration
object. See The Configuration Class and skip_embedded_fonts for more information.
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