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sldtoppm(1) General Commands Manual sldtoppm(1)
NAME
sldtoppm - convert an AutoCAD slide file into a portable pixmap
SYNOPSIS
sldtoppm [-adjust] [-dir] [-height|-ysize s] [-info] [-lib|-Lib name] [-scale s] [-ver-
bose] [-width|-xsize s] [slidefile]
DESCRIPTION
Reads an AutoCAD(R) slide file and outputs a portable pixmap. If no slidefile is speci-
fied, input is read from standard input. The ppmdraw library is used to convert the vec-
tor and polygon information in the slide file to a pixmap; see the file ppmdraw.h for de-
tails on this package.
OPTIONS
-adjust
If the display on which the slide file was created had non-square pixels, when the
slide is processed with sldtoppm and the -adjust option is not present, the follow-
ing warning will appear:
Warning - pixels on source screen were non-square.
Specifying -adjust will correct image width to compensate.
Specifying the -adjust option causes sldtoppm to scale the width of the image so
that pixels in the resulting portable pixmap are square (and hence circles appear
as true circles, not ellipses). The scaling is performed in the vector domain, be-
fore scan converting the objects. The results are, therefore, superior in appear-
ance to what you'd obtain were you to perform the equivalent scaling with pnmscale
after the bitmap had been created.
-dir The input is assumed to be an AutoCAD slide library file. A directory listing each
slide in the library is printed on standard error.
-height size
Scales the image in the vector domain so it is size pixels in height. If no -width
or -xsize option is specified, the width will be adjusted to preserve the pixel as-
pect ratio.
-info Dump the slide file header on standard error, displaying the original screen size
and aspect ratio among other information.
-lib name
Extracts the slide with the given name from the slide library given as input. The
specified name is converted to upper case.
-Lib name
Extracts the slide with the given name from the slide library given as input. The
name is used exactly as specified; it is not converted to upper case.
-scale s
Scales the image by factor s, which may be any floating point value greater than
zero. Scaling is done after aspect ratio adjustment, if any. Since scaling is
performed in the vector domain, before rasterisation, the results look much better
than running the output of sldtoppm through pnmscale.
-verbose
Dumps the slide file header and lists every vector and polygon in the file on stan-
dard error.
-width size
Scales the image in the vector domain so it is size pixels wide. If no -height or
-ysize option is specified, the height will be adjusted to preserve the pixel as-
pect ratio.
-xsize size
Scales the image in the vector domain so it is size pixels wide. If no -height or
-ysize option is specified, the height will be adjusted to preserve the pixel as-
pect ratio.
-ysize size
Scales the image in the vector domain so it is size pixels in height. If no -width
or -xsize option is specified, the width will be adjusted to preserve the pixel as-
pect ratio.
All flags can be abbreviated to their shortest unique prefix.
BUGS
Only Level 2 slides are converted. Level 1 format has been obsolete since the advent of
AutoCAD Release 9 in 1987, and was not portable across machine architectures.
Slide library items with names containing 8 bit (such as ISO) or 16 bit (Kanji, for exam-
ple) characters may not be found when chosen with the -lib option unless sldtoppm has been
built with character set conversion functions appropriate to the locale. You can always
retrieve slides from libraries regardless of the character set by using the -Lib option
and specifying the precise name of library member. Use the -dir option to list the slides
in a library if you're unsure of the exact name.
SEE ALSO
AutoCAD Reference Manual: Slide File Format, pnmscale(1), ppm(5)
AUTHOR
John Walker
Autodesk SA
Avenue des Champs-Montants 14b
CH-2074 MARIN
Suisse/Schweiz/Svizzera/Svizra/Switzerland
Usenet: kelvin AT Autodesk.com
Fax: 038/33 88 15
Voice: 038/33 76 33
Permission to use, copy, modify, and distribute this software and its documentation for
any purpose and without fee is hereby granted, without any conditions or restrictions.
This software is provided ``as is'' without express or implied warranty.
AutoCAD and Autodesk are registered trademarks of Autodesk, Inc.
10 October 1991 sldtoppm(1)
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