sldtoppm


SYNOPSIS
       sldtoppm [-adjust] [-dir] [-height|-ysize s] [-info] [-lib|-Lib name]
              [-scale s] [-verbose] [-width|-xsize s] [slidefile]

DESCRIPTION
       Reads an AutoCAD(R) 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  con-
              verting  the  objects.   The results are, therefore, superior in
              appearance to what you'd obtain were you to perform the  equiva-
              lent 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  stan-
              dard 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
              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  conver-
       sion  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,  with-
       out  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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