pnmtopalm(1) - man - phpman

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Convert a PNM image to a Palm bitmap.

Convert a PNM image to a Palm bitmap
pnmtopalm {{path/to/file.pnm}} > {{path/to/file.palm}}
Specify the color depth of the resulting bitmap
pnmtopalm {{-dep|-depth}} {{1|2|4|8|16}} {{path/to/file.pnm}} > {{path/to/file.palm}}
Choose a compression method for the resulting bitmap
pnmtopalm -{{scanline_compression|rle_compression|packbits_compression}} {{path/to/file.pnm}} > {{path/to/file.palm}}
Build a custom colormap and include it in the resulting bitmap
pnmtopalm {{-c|-colormap}} {{path/to/file.pnm}} > {{path/to/file.palm}}
Specify the bitmap's density
pnmtopalm {{-den|-density}} {{72|108|144|216|288}} {{path/to/file.pnm}} > {{path/to/file.palm}}

pnmtopalm(1) General Commands Manual pnmtopalm(1)

NAME
pnmtopalm - convert a portable anymap into a Palm pixmap

SYNOPSIS
pnmtopalm [-verbose] [-depth N] [-maxdepth N] [-colormap] [-transparent color] [-offset]
[-rle-compression|-scanline-compression] [pnmfile]

DESCRIPTION
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 colors
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 colormap 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 palmcolor8.map (232 col‐
ors in default Palm colormap).

OPTIONS
-verbose
Display the format of the output file.

-depth N
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 out‐
put 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 format is also compati‐
ble with the various PalmOS 3.x versions used in the Handspring Visor, so these images
may also work in that device.

-maxdepth N
Produce a file of minimal depth, but in any case less than N bits wide. If you spec‐
ify 16-bit, the output will always be 16-bit direct color.

-offset
Fill in the nextDepthOffset field in the file header, to provide for multiple rendi‐
tions of the pixmap in the same file.

-colormap
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 colormap for
color output.

-transparent color
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.

-rle-compression
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 higher.

-scanline-compression
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.

SEE ALSO
palmtopnm(1), ppmquant(1), pnm(5)

NOTES
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 op‐
tion. Then concatenate the individual renditions together in a single file using cat.

AUTHORS
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 func‐
tion.
Copyright 1995-2001 by Ian Goldberg, George Caswell, and Bill Janssen.

7 December 2000 pnmtopalm(1)