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)