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ppmtowinicon(1)


NAME

   ppmtowinicon  -  convert 1 or more portable pixmaps into a Windows .ico
   file

SYNOPSIS

   ppmtowinicon [-andpgms] [-output output.ico] [ppmfiles...]

DESCRIPTION

   Reads one or more portable pixmaps  as  input.   Produces  a  Microsoft
   Windows .ico file as output.

   A  Windows icon contains 1 or more images, at different resolutions and
   color depths.

   Microsoft recommends including at least the following formats  in  each
   icon (size and bits-per-pixel):

   16 x 16 - 4 bpp

   32 x 32 - 4 bpp

   48 x 48 - 8 bpp

   Default I/O is STDIN/STDOUT.

OPTIONS

   -andpgms
          If  this  option  is given, every second file is read as an "and
          mask" to be used  by  windows  for  transparency  data  for  the
          previous  image. (These are set to fully opaque by default). The
          and mask is a PGM image, where any pixel with  maxval  intensity
          means  opaque and any other pixel means not opaque. Note that as
          with all Netpbm programs, you may use a PBM  file  here  and  it
          will be used as if it were the equivalent PGM.

          The and mask is like an alpha mask, except for what it signifies
          in the "not opaque" areas. In the  usual  case,  the  foreground
          image  is  black  in those areas, and in that case the areas are
          fully transparent -- the background shows through the icon.  But
          in general, a not opaque pixel signifies that the background and
          foreground should be merged as follows: The intensities  of  the
          color   components   in   the  forgeground  and  background  are
          represented as binary numbers, then corresponding  bits  of  the
          background   and   foreground   intensities  are  exlusive-or'ed
          together. So there is a sort of reverse video effect.

   -output output.ico
          File to write.  By default, the icon is written to stdout.

SEE ALSO

   winicontoppm(1), ppm(5)

AUTHOR

   Copyright (C) 2000 by Lee Benfield.

                              22 May 2000                  ppmtowinicon(1)



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