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<H1>FAX2TIFF</H1>
Section: User Commands  (1)<BR>Updated: September 24, 1994<BR><A HREF="#index">Index</A>
<BR><A HREF="index.html">Return to Main Contents</A>
<HR>

<A NAME="lbAB">&nbsp;</A>
<H2>NAME</H2>

fax2tiff - create a
<FONT SIZE="-1">TIFF</FONT>
Class F fax file from raw fax data
<A NAME="lbAC">&nbsp;</A>
<H2>SYNOPSIS</H2>

<B>fax2tiff</B>

[
<I>options</I>

] [
<B>-o</B>

<I>output.tif</I>

]
<I>input.g3</I>

<A NAME="lbAD">&nbsp;</A>
<H2>DESCRIPTION</H2>

<I>Fax2tiff</I>

creates a
<FONT SIZE="-1">TIFF</FONT>
file containing 
<FONT SIZE="-1">CCITT</FONT>
Group 3 or Group 4 encoded data from one or more files containing ``raw''
Group 3 encoded data (typically obtained directly from a fax modem).
By default, each row of data in the resultant
<FONT SIZE="-1">TIFF</FONT>
file is 2-dimensionally encoded and
padded or truncated to 1728 pixels, as needed.
The resultant image is a set of low resolution (98 lines/inch)
or medium resolution (196 lines/inch)
pages, each of which is a single strip of data.
The generated file conforms to the
<FONT SIZE="-1">TIFF</FONT>
Class F (<FONT SIZE="-1">FAX</FONT>) specification for storing facsimile data.
This means, in particular, that each page of the data does
<B>not</B>

include the trailing 
<I>return to control</I>

(<FONT SIZE="-1">RTC</FONT>) code; as required
for transmission by the
<FONT SIZE="-1">CCITT</FONT>
Group 3 specifications.
The old, ``classic'', format is created if the
<B>-c</B>

option is used.
(The Class F format can also be requested with the
<B>-f</B>

option.)
<P>

The default name of the output image is
<I>fax.tif</I>;

this can be changed with the
<B>-o</B>

option.
Each input file is assumed to be a separate page of facsimile data
from the same document.
The order in which input files are specified on the command
line is the order in which the resultant pages appear in the
output file.
<A NAME="lbAE">&nbsp;</A>
<H2>OPTIONS</H2>

Options that affect the interpretation of input data are:
<DL COMPACT>
<DT><B>-2</B>

<DD>
Assume input data is 2-d Huffman encoded.
<DT><B>-B</B>

<DD>
Assume input data was encoded with
black as 0 and white as 1.
<DT><B>-L</B>

<DD>
Treat input data as having bits filled from least
significant bit (<FONT SIZE="-1">LSB</FONT>) to most significant bit (<FONT SIZE="-1">MSB</FONT>).
(This is the default.)
<DT><B>-M</B>

<DD>
Treat input data as having bits filled from most
significant bit (<FONT SIZE="-1">MSB</FONT>) to most least bit (<FONT SIZE="-1">LSB</FONT>).
<DT><B>-R</B>

<DD>
Specify the vertical resolution, in lines/inch, of the
input images.
By default input are assumed to have a vertical
resolution of 196 lines/inch.
If images are low resolution facsimile, a value of
98 lines/inch should be specified.
<DT><B>-W</B>

<DD>
Assume input data was encoded with
black as 1 and white as 0.
(This is the default.)
</DL>
<P>

Options that affect the output file format are:
<DL COMPACT>
<DT><B>-1</B>

<DD>
Force output to be compressed with the 1-dimensional
version of the
<FONT SIZE="-1">CCITT</FONT>
Group 3 Huffman encoding algorithm.
<DT><B>-4</B>

<DD>
Force output to be compressed with the
<FONT SIZE="-1">CCITT</FONT>
Group 4 Huffman encoding.
<DT><B>-o</B>

<DD>
Specify the name of the output file.
<DT><B>-p</B>

<DD>
Force the last bit of each
<I>End Of Line</I>

(<FONT SIZE="-1">EOL</FONT>) code to land on a byte boundary.
This ``zero padding'' will be reflected in the contents of the
<I>Group3Options</I>

tag of the resultant
<FONT SIZE="-1">TIFF</FONT>
file.
<DT><B>-s</B>

<DD>
Stretch the input image vertically by writing each input row of
data twice to the output file.
<DT><B>-v</B>

<DD>
Force
<I>fax2tiff</I>

to print the number of rows of data it retrieved from the input file.
</DL>
<A NAME="lbAF">&nbsp;</A>
<H2>DIAGNOSTICS</H2>

The following warnings and errors come from the decoding
routines in the library.
<P>

<B>Warning, %s: Premature EOL at scanline %d (x %d).\n</B>.

The input data had a row that was shorter than the expected value of 1728.
The row is padded with white.
<P>

<B>%s: Premature EOF at scanline %d (x %d).\n</B>.

The decoder ran out of data in the middle of a scanline.
The resultant row is padded with white.
<P>

<B>%s: Bad code word at row %d, x %d\n</B>.

An invalid Group 3 
<I>code</I>

was encountered while decoding the input file. 
The row number and horizontal position is given.
The remainder of the input row is discarded, while
the corresponding output row is padded with white.
<P>

<B>%s: Bad 2D code word at scanline %d.\n</B>.

An invalid Group 4 or 2D Group 3
<I>code</I>

was encountered while decoding the input file. 
The row number and horizontal position is given.
The remainder of the input row is discarded, while
the corresponding output row is padded with white.
<A NAME="lbAG">&nbsp;</A>
<H2>BUGS</H2>

Should not have the constant width 1728 built into it.
Input data are assumed to have a a ``top left'' orientation;
it should be possible to override this assumption
from the command line.
<A NAME="lbAH">&nbsp;</A>
<H2>SEE ALSO</H2>

<I></I><FONT SIZE="-1"><I>CCITT</I></FONT><I> Recommendation T.4</I>

(Standardization of Group 3 Facsimile Apparatus for Document Transmission).
<P>

<I>The Spirit of TIFF Class F</I>,

an appendix to the TIFF 5.0 specification prepared by Cygnet Technologies.
<P>

<I><A HREF="tiffinfo+1.html">tiffinfo</A></I>(1),

<I><A HREF="tiffdither+1.html">tiffdither</A></I>(1),

<I><A HREF="tiffgt+1.html">tiffgt</A></I>(1),

<I><A HREF="libtiff+3">libtiff</A></I>(3).


<HR>
<A NAME="index">&nbsp;</A><H2>Index</H2>
<DL>
<DT><A HREF="#lbAB">NAME</A><DD>
<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
<DT><A HREF="#lbAE">OPTIONS</A><DD>
<DT><A HREF="#lbAF">DIAGNOSTICS</A><DD>
<DT><A HREF="#lbAG">BUGS</A><DD>
<DT><A HREF="#lbAH">SEE ALSO</A><DD>
</DL>
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