pnmtopalm - convert a portable anymap into a Palm pixmap
pnmtopalm [-verbose] [-depth N] [-maxdepth N] [-colormap] [-transparent color] [-offset]
Reads a PNM image as input, from stdin or pnmfile. Produces a Palm pixmap as output.
Palm pixmap files are either greyscale files 1, 2, or 4 bits wide, or color files 8 bits
wide, so pnmtopalm automatically scales colors to have an appropriate maxval, unless you
specify a depth or max depth. Input files must have an appropriate number and set of col-
ors for the selected output constraints. This often means that you should run the PNM
image through ppmquant before you pass it to pnmtopalm. Netpbm comes with several col-
ormap files you can use with ppmquant for this purpose. They are palmgray2.map (4 shades
of gray for a depth of 2), palmgray4.map (16 shades of gray for a depth of 4), and palm-
color8.map (232 colors in default Palm colormap).
Display the format of the output file.
Produce a file of depth N, where N must be either 1, 2, 4, 8, or 16. Any depth
greater than 1 will produce a version 1 or 2 bitmap. Because the default Palm
8-bit colormap is not grayscale, if the input is a grayscale or monochrome pixmap,
the output will never be more than 4 bits deep, regardless of the specified depth.
Note that 8-bit color works only in PalmOS 3.5 (and higher), and 16-bit direct
color works only in PalmOS 4.0 (and higher). However, the 16-bit direct color for-
mat is also compatible with the various PalmOS 3.x versions used in the Handspring
Visor, so these images may also work in that device.
Produce a file of minimal depth, but in any case less than N bits wide. If you
specify 16-bit, the output will always be 16-bit direct color.
Fill in the nextDepthOffset field in the file header, to provide for multiple ren-
ditions of the pixmap in the same file.
Build a custom colormap and include it in the output file. This is not recommended
by Palm, for efficiency reasons. Otherwise, pnmtopalm uses the default Palm col-
ormap for color output.
Marks one particular color as fully transparent. The format to specify the color
is either (when for example orange) "1.0,0.5,0.0", where the values are floats
between zero and one, or with the syntax "#RGB", "#RRGGBB" or "#RRRRGGGGBBBB" where
R, G and B are hexadecimal numbers. This also makes the output bitmap a version 2
bitmap. Transparency works only on Palm OS 3.5 and higher.
Specifies that the output Palm bitmap will use the Palm RLE compression scheme, and
will be a version 2 bitmap. RLE compression works only with Palm OS 3.5 and
Specifies that the output Palm bitmap will use the Palm scanline compression
scheme, and will be a version 2 bitmap. Scanline compression works only in Palm OS
2.0 and higher.
palmtopnm(1), ppmquant(1), pnm(5)
An additional compression format, packbits, was added with PalmOS 4.0. This package
should be updated to be able to generate that.
Palm pixmaps may contains multiple renditions of the same pixmap, in different depths. To
construct an N-multiple-rendition Palm pixmap with pnmtopalm, first construct renditions 1
through N-1 using the -offset option, then construct the Nth pixmap without the -offset
option. Then concatenate the individual renditions together in a single file using cat.
This program was originally written as ppmtoTbmp.c, by Ian Goldberg and George Caswell.
It was completely re-written by Bill Janssen to add color, compression, and transparency
Copyright 1995-2001 by Ian Goldberg, George Caswell, and Bill Janssen.
7 December 2000 pnmtopalm(1)