sldtoppm



Sldtoppm User Manual(0)                                Sldtoppm User Manual(0)




NAME

       sldtoppm - convert an AutoCAD slide file to a PPM image



SYNOPSIS

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

       All options can be abbreviated to their shortest unique prefix.



DESCRIPTION

       This program is part of Netpbm(1).

       sldtoppm reads an AutoCAD® slide file and outputs a PPM image.  If  you
       don’t  specify  slidefile,  sldtoppm  reads  input from Standard Input.
       sldtoppm uses the ppmdraw library to convert  the  vector  and  polygon
       information  in  the slide file to a raster; 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  you  process  the slide with sldtoppm and
              don’t specify -adjust, sldtoppm issues the following warning;

              Warning - pixels on source screen were non-square.

              Specifying -adjust will correct the 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 pamscale 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 you don’t specify -width or -xsize, sldtoppm adjusts
              the width 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.  sldtoppm converts the specified name to upper
              case.


       -Lib name
              Extracts the slide with the given name from  the  slide  library
              given  as  input.   sldtoppm uses name in the case specified; it
              does not convert it to upper case.


       -scale s
              Scales the image by factor s, which may be  any  floating  point
              value greater than zero.  sldtoppm does the scaling after aspect
              ratio adjustment, if any.  Since it does the scaling in the vec-
              tor  domain,  before rasterisation, the results look much better
              than running the output of sldtoppm through pamscale.


       -verbose
              Dumps the slide file header and lists every vector  and  polygon
              to Standard Error.


       -width size
              Scales the image in the vector domain so it is size pixels wide.
              If you don’t specify -height or  -ysize,  sldtoppm  adjusts  the
              height to preserve the pixel aspect ratio.


       -xsize size
              Scales the image in the vector domain so it is size pixels wide.
              If you don’t specify -height or  -ysize,  sldtoppm  adjusts  the
              height to preserve the pixel aspect ratio.


       -ysize size
              Scales  the  image  in the vector domain so it is size pixels in
              height.  If you don’t specify -width or -xsize, sldtoppm adjusts
              the width to preserve the pixel aspect ratio.





LIMITATIONS

       sldtoppm  can  convert  only  Level  2 slides.  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  was 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, pamscale(1), ppm(1)



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.



netpbm documentation            10 October 1991        Sldtoppm User Manual(0)

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