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SFDDIFF(1)                                                SFDDIFF(1)

       sfddiff - compare two font files

       sfddiff  [--help] [--ignorehints] [--ignorenames] [--ignoreg‐
       pos]  [--ignoregsub]  [--ignorebitmaps]  [--exact]   [--warn]
       [-merge outfile] [--usage] [--version] fontfile1 fontfile2

       The  program sfddiff compares two font files, which may be in
       any format fontforge(1) can read.  It will notice the follow‐
       ing differences:

       1)     Characters  are  present  in  one  font but not in the

       2)     Characters are present in both fonts but have  differ‐
              ent  sets  of outlines or references. The outlines may
              be compared so that only exact matches  are  accepted,
              or  so that a fuzzier match is used.  Similarly refer‐
              ences may need to match exactly,  or  may  be  matched
              after an unlink.

       This  fuzzy  comparison is useful when comparing truetype and
       postscript fonts, or when comparing a font with references to
       one without.

       3)     The postscript hints or truetype instructions are dif‐

       4)     The font names (the truetype 'name' table) differ.

       5)     The kerning (and other gpos information) differs.

       6)     The ligatures (and other gsub information) differ.

       7)     Any bitmap strikes present in one font but not in  the

       8)     Any  bitmap  characters  present  in one strike of one
              font but in the equivalent strike of the other.

       9)     Any bitmap characters which differ.

       --help Provide a description with a  list  of  the  available

              Suppress  the  reporting  of  hint/instruction differ‐

              Suppress the reporting of  kerning  (and  other  gpos)

              Suppress  the  reporting  of ligature (and other gsub)

              Suppress the reporting of name string differences.

              Suppress the reporting of bitmap differences.

              Require outlines to match exactly.

       --warn Warn if the outlines/references are  slightly  differ‐

       -merge outfile
              Store a merged version of the two fonts into the spec‐
              ified output file.  The merged data will be  based  on
              sfdfile1,  as  well  as any characters present in sfd‐
              file2 but not in  sfdfile1willbeadded,andtheoutlinesof
              sfdfile2  will  be placed in the background.  Finally,
              for any characters with different outlines  or  refer‐
              ences the background of the the character will contain
              the  outlines  from  sfdfile2  (references   will   be
              unlinked into outlines and those outlines also will be

              Display the usage description.

              Display the current version


       The HTML version of the fontforge manual at:

       Copyright (C) 2000-2006 by George Williams  (
       Manual  page  heavily  rewritten and modified to use standard
       -man(5) macros by R.P.C.  Rodgers  (,  23
       October 2002.

                            8 April 2006                  SFDDIFF(1)
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