The grohtml front end (which consists of a preprocessor, pre-grohtml,
and a device driver, post-grohtml) translates the output of GNU troff
to html. Users should always invoke grohtml via the groff command
with a -Thtml option. If no files are given, grohtml will read the
standard input. A filename of - will also cause grohtml to read the
standard input. Html output is written to the standard output. When
grohtml is run by groff options can be passed to grohtml using
groff's -P option.
grohtml invokes groff twice. In the first pass, pictures, equations,
and tables are rendered using the ps device, and in the second pass
HTML output is generated by the html device.
grohtml always writes output in UTF-8 encoding and has built-in
entities for all non-composite unicode characters. In spite of this,
groff may issue warnings about unknown special characters if they
can't be found during the first pass. Such warnings can be safely
ignored unless the special characters appear inside a table or
Number of bits of antialiasing information to be used by text
when generating png images. The default is 4 but valid values
are 0, 1, 2, and 4. Note your version of gs needs to support
the -dTextAlphaBits and -dGraphicAlphaBits options in order to
exploit antialiasing. A value of 0 stops grohtml from issuing
antialiasing commands to gs.
-b Initialize the background color to white.
-Ddir Inform grohtml to place all image files into directory dir.
-e This option should not be directly invoked by the user as it
is an internal option utilized by groff when -Thtml or -Txhtml
is specified. It is used by the grohtml preprocessor to
determine whether eqn should attempt to produce MathML (if
-Txhtml is specified).
-Fdir Prepend directory dir/devname to the search path for font and
device description files; name is the name of the device,
Number of bits of antialiasing information to be used by
graphics when generating png images. The default is 4 but
valid values are 0, 1, 2, and 4. Note your version of gs
needs to support the -dTextAlphaBits and -dGraphicAlphaBits
options in order to exploit antialiasing. A value of 0 stops
grohtml from issuing antialiasing commands to gs.
-h Generate section and number headings by using <B>...</B> and
increasing the font size, rather than using the <Hn>...</Hn>
Select the resolution for all images. By default this is 100
pixels per inch. Example: -i200 indicates 200 pixels per
-Istem Determine the image stem name. If omitted grohtml uses
grohtml-XXX (XXX is the process ID).
Inform grohtml to split the html output into multiple files.
The filename is the stem and specified section headings
(default is level one) start a new file, named filename-n.html.
-l Turn off the production of automatic section links at the top
of the document.
-n Generate simple heading anchors whenever a section/number
heading is found. Without the option the anchor value is the
textual heading. This can cause problems when a heading
contains a ‘?’ on older versions of some browsers (Netscape).
This flag is automatically turned on if a heading contains an
Specify the vertical offset of images in points.
-p Display page rendering progress to stderr. grohtml only
displays a page number when an image is required.
-r Turn off the automatic header and footer line (html rule).
Set the base point size of the source file. Thereafter when
this point size is used in the source it will correspond to
the html base size. Every increase of two points in the
source will yield a <big> tag, and conversely when a decrease
of two points is seen a <small> tag is emitted.
When splitting html output, split at the heading level (or
higher) defined by level.
-v Print the version number.
-V Create an XHTML or HTML validator button at the bottom of each
page of the document.
Select HTML dialect. Currently, dialect should be either the
digit 4 or the letter x which indicates whether grohtml should
generate HTML 4 or XHTML, respectively. This option should
not be directly invoked by the user as it is an internal
option utilized by groff when -Thtml or -Txhtml is specified.
-y Produce a right-justified groff signature at the end of the
document. This is only generated if the -V flag is also
grohtml is dependent upon the png utilities (pnmcut, pnmcrop,
pnmtopng) and GhostScript (gs). pnmtopng (version 2.37.6 or greater)
and pnmcut from the netpbm package (version 9.16 or greater) will
work also. It is also dependent upon psselect from the PSUtils
package. Images are generated whenever a table, picture, equation or
line is encountered.
This page is part of the groff (GNU troff) project. Information
about the project can be found at
⟨http://www.gnu.org/software/groff/⟩. If you have a bug report for
this manual page, see ⟨http://www.gnu.org/software/groff/⟩. This
page was obtained from the tarball groff-1.22.3.tar.gz fetched from
⟨ftp://ftp.gnu.org/gnu/groff/⟩ on 2016-09-01. If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
Groff Version 1.22.3 4 November 2014 GROHTML(1)