[Coco] perl script to convert pics for Sockmaster's Hicolor prog

[Joel Ewy]

Here's a little perl script I cooked up -- it's pretty raw and doesn't  do any error checking, etc.  It's only been tested on a single  computer runing RedHat Linux 8.  No warranty, no responsibility,  bla, bla, bla.
  
  The purpose is to take multiple .jpg files of arbitrary dimensions,  scale them en masse so that they fit inside a 320 x 200 CoCo screen,  and convert them to 8-bit BMP files that can be displayed by John  Kowalski's HiColor program.
  
  You need to have the NETPBM utils installed.  I have used djpeg  instead of jpegtopnm -- I don't really exactly remember why, but for  some reason it worked better for me.  djpeg probably comes from  the JPEG library, but the jpegtopnm  utility from NETPBM can  probably be substituted though I think the syntax would need to be  changed.
  
  Though I haven't tested this, I would think it could be made to work  under MS-Windows in Cygwin.  And, the NETPBM tools have been  ported to OS9-68K.  I have on floppy a binary of Perl 4 that  somebody from the EFFO (I think) compiled for 68k and emailed to me  around 1995 or 1996.  He suggested that source would be available  sometime, but I never saw it.  I haven't studied Perl's Artistic  Licence enough to know whether it is proper to distribute this binary  without source, but if anyone wants a copy I'd be happy to share.   I haven't tried cocovert.pl on the MM/1, but it's simple enough it  should be adaptable.  And it could easily be rewritten as a shell  script or maybe in OddJob.
  
  Anybody who would like to modify this for whatever purpose is  welcome.  I would be inclined to GPL it, though I don't feel the  urge to tack a copy of the license onto this email if nobody is  especially interested in it.  Maybe that should be done if it gets  archived and posted on rtsi.com.
  
  Code follows:
  
  cocovert.pl
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  #!/usr/bin/perl
  # cocovert.pl Scale and convert JPEG images for use with Sockmaster's HiColor
  # viewer on the Tandy CoCo3.  Joel Ewy 2005
  
  @filelist = @ARGV;
  
  if (!(-s "blackmatte.ppm")) {
   system ("ppmmake black 320 200 >blackmatte.ppm");
  }
  
  for ($i = 0; $i < (@ARGV); $i++) {
   $filelist[$i] =~ s/jpg/bmp/i;
   system ("djpeg $ARGV[$i] | pnmscale -xysize 320 200 >$filelist[$i].ppm");
   system ("pnmcomp -align=center -valign=middle $filelist[$i].ppm blackmatte.ppm >$filelist[$i]1.ppm");
   system ("ppmquantneural <$filelist[$i]1.ppm 256 >map.ppm");
   system ("pnmremap -mapfile=map.ppm <$filelist[i]1.ppm >$filelist[$i].ppm");
   system ("ppmtobmp -bpp=8 <$filelist[$i].ppm >$filelist[$i]");
   # system ("rm $filelist[$i]*.ppm");
  }
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