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] [-verbose] [-width|-xsize s] [slidefile]
DESCRIPTION
Reads an AutoCAD slide file and outputs a portable pixmap. If no slidefile is specified, input is read from standard input. The ppmdraw library is used to convert the vector and polygon information in the slide file to a pixmap; see the file ppmdraw.h for details 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 following 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, before scan
converting the objects. The results are, therefore, superior in
appearance 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 aspect 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 standard 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 aspect 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 aspect 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 aspect 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 example) 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@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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