258 lines
6.0 KiB
HTML
258 lines
6.0 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML><HEAD><TITLE>Manpage of FAX2TIFF</TITLE>
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</HEAD><BODY BGCOLOR=WHITE><FONT FACE="helvetica, sans, arial">
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<H1>FAX2TIFF</H1>
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Section: User Commands (1)<BR>Updated: September 24, 1994<BR><A HREF="#index">Index</A>
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<BR><A HREF="index.html">Return to Main Contents</A>
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<HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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fax2tiff - create a
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<FONT SIZE="-1">TIFF</FONT>
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Class F fax file from raw fax data
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>fax2tiff</B>
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[
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<I>options</I>
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] [
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<B>-o</B>
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<I>output.tif</I>
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]
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<I>input.g3</I>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<I>Fax2tiff</I>
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creates a
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<FONT SIZE="-1">TIFF</FONT>
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file containing
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<FONT SIZE="-1">CCITT</FONT>
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Group 3 or Group 4 encoded data from one or more files containing ``raw''
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Group 3 encoded data (typically obtained directly from a fax modem).
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By default, each row of data in the resultant
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<FONT SIZE="-1">TIFF</FONT>
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file is 2-dimensionally encoded and
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padded or truncated to 1728 pixels, as needed.
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The resultant image is a set of low resolution (98 lines/inch)
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or medium resolution (196 lines/inch)
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pages, each of which is a single strip of data.
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The generated file conforms to the
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<FONT SIZE="-1">TIFF</FONT>
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Class F (<FONT SIZE="-1">FAX</FONT>) specification for storing facsimile data.
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This means, in particular, that each page of the data does
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<B>not</B>
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include the trailing
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<I>return to control</I>
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(<FONT SIZE="-1">RTC</FONT>) code; as required
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for transmission by the
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<FONT SIZE="-1">CCITT</FONT>
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Group 3 specifications.
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The old, ``classic'', format is created if the
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<B>-c</B>
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option is used.
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(The Class F format can also be requested with the
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<B>-f</B>
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option.)
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<P>
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The default name of the output image is
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<I>fax.tif</I>;
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this can be changed with the
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<B>-o</B>
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option.
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Each input file is assumed to be a separate page of facsimile data
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from the same document.
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The order in which input files are specified on the command
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line is the order in which the resultant pages appear in the
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output file.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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Options that affect the interpretation of input data are:
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<DL COMPACT>
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<DT><B>-2</B>
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<DD>
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Assume input data is 2-d Huffman encoded.
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<DT><B>-B</B>
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<DD>
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Assume input data was encoded with
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black as 0 and white as 1.
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<DT><B>-L</B>
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<DD>
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Treat input data as having bits filled from least
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significant bit (<FONT SIZE="-1">LSB</FONT>) to most significant bit (<FONT SIZE="-1">MSB</FONT>).
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(This is the default.)
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<DT><B>-M</B>
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<DD>
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Treat input data as having bits filled from most
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significant bit (<FONT SIZE="-1">MSB</FONT>) to most least bit (<FONT SIZE="-1">LSB</FONT>).
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<DT><B>-R</B>
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<DD>
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Specify the vertical resolution, in lines/inch, of the
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input images.
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By default input are assumed to have a vertical
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resolution of 196 lines/inch.
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If images are low resolution facsimile, a value of
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98 lines/inch should be specified.
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<DT><B>-W</B>
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<DD>
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Assume input data was encoded with
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black as 1 and white as 0.
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(This is the default.)
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</DL>
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<P>
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Options that affect the output file format are:
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<DL COMPACT>
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<DT><B>-1</B>
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<DD>
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Force output to be compressed with the 1-dimensional
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version of the
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<FONT SIZE="-1">CCITT</FONT>
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Group 3 Huffman encoding algorithm.
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<DT><B>-4</B>
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<DD>
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Force output to be compressed with the
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<FONT SIZE="-1">CCITT</FONT>
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Group 4 Huffman encoding.
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<DT><B>-o</B>
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<DD>
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Specify the name of the output file.
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<DT><B>-p</B>
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<DD>
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Force the last bit of each
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<I>End Of Line</I>
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(<FONT SIZE="-1">EOL</FONT>) code to land on a byte boundary.
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This ``zero padding'' will be reflected in the contents of the
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<I>Group3Options</I>
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tag of the resultant
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<FONT SIZE="-1">TIFF</FONT>
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file.
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<DT><B>-s</B>
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<DD>
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Stretch the input image vertically by writing each input row of
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data twice to the output file.
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<DT><B>-v</B>
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<DD>
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Force
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<I>fax2tiff</I>
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to print the number of rows of data it retrieved from the input file.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>DIAGNOSTICS</H2>
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The following warnings and errors come from the decoding
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routines in the library.
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<P>
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<B>Warning, %s: Premature EOL at scanline %d (x %d).\n</B>.
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The input data had a row that was shorter than the expected value of 1728.
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The row is padded with white.
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<P>
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<B>%s: Premature EOF at scanline %d (x %d).\n</B>.
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The decoder ran out of data in the middle of a scanline.
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The resultant row is padded with white.
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<P>
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<B>%s: Bad code word at row %d, x %d\n</B>.
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An invalid Group 3
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<I>code</I>
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was encountered while decoding the input file.
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The row number and horizontal position is given.
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The remainder of the input row is discarded, while
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the corresponding output row is padded with white.
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<P>
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<B>%s: Bad 2D code word at scanline %d.\n</B>.
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An invalid Group 4 or 2D Group 3
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<I>code</I>
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was encountered while decoding the input file.
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The row number and horizontal position is given.
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The remainder of the input row is discarded, while
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the corresponding output row is padded with white.
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<A NAME="lbAG"> </A>
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<H2>BUGS</H2>
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Should not have the constant width 1728 built into it.
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Input data are assumed to have a a ``top left'' orientation;
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it should be possible to override this assumption
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from the command line.
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<A NAME="lbAH"> </A>
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<H2>SEE ALSO</H2>
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<I></I><FONT SIZE="-1"><I>CCITT</I></FONT><I> Recommendation T.4</I>
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(Standardization of Group 3 Facsimile Apparatus for Document Transmission).
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<P>
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<I>The Spirit of TIFF Class F</I>,
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an appendix to the TIFF 5.0 specification prepared by Cygnet Technologies.
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<P>
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<I><A HREF="tiffinfo+1.html">tiffinfo</A></I>(1),
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<I><A HREF="tiffdither+1.html">tiffdither</A></I>(1),
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<I><A HREF="tiffgt+1.html">tiffgt</A></I>(1),
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<I><A HREF="libtiff+3">libtiff</A></I>(3).
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT><A HREF="#lbAB">NAME</A><DD>
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<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT><A HREF="#lbAE">OPTIONS</A><DD>
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<DT><A HREF="#lbAF">DIAGNOSTICS</A><DD>
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<DT><A HREF="#lbAG">BUGS</A><DD>
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<DT><A HREF="#lbAH">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="index.html">man2html</A>,
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using the manual pages.<BR>
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Time: 01:31:47 GMT, November 23, 1999
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</BODY>
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</HTML>
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