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SFDDIFF(1)									       SFDDIFF(1)

NAME
       sfddiff - compare two font files

SYNOPSIS
       sfddiff	  [--help]    [--ignorehints]	[--ignorenames]   [--ignoregpos]   [--ignoregsub]
       [--ignorebitmaps] [--exact] [--warn] [--merge  outfile]	[--usage]  [--version]	fontfile1
       fontfile2

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

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

       2)     Characters are present in both fonts but have different sets of outlines or  refer-
	      ences.  The outlines may be compared so that only exact matches are accepted, or so
	      that a fuzzier match is used.  Similarly references 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 different.

       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 other.

       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.

OPTIONS
       --help Provide a description with a list of the available options.

       --ignorehints
	      Suppress the reporting of hint/instruction differences.

       --ignoregpos
	      Suppress the reporting of kerning (and other `gpos') differences.

       --ignoregsub
	      Suppress the reporting of ligature (and other `gsub') differences.

       --ignorenames
	      Suppress the reporting of name string differences.

       --ignorebitmaps
	      Suppress the reporting of bitmap differences.

       --exact
	      Require outlines to match exactly.

       --warn Warn if the outlines/references are slightly different.

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

       --usage
	      Display the usage description.

       --version
	      Display the current version.

SEE ALSO
       fontforge(1)

       The HTML version of the fontforge manual at:

	      http://fontforge.sourceforge.net/

AUTHOR
       Copyright (C) 2000-2006 by George Williams (gww@silcom.com).  Manual page heavily  rewrit-
       ten  and  modified to use standard -man(5) macros by R.P.C. Rodgers (rodgers@nlm.nih.gov),
       23 October 2002.

					   8 April 2006 			       SFDDIFF(1)
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