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Pnmtopalm User Manual(0)                              Pnmtopalm User Manual(0)

       pnmtopalm - convert a PNM image to a Palm Bitmap









       [-withdummy] [-scanline-compression | -rle-compression | -packbits-compression]


       Minimum  unique  abbreviation  of option is acceptable.  You may use double hyphens instead of single hyphen to
       denote options.  You may use white space in place of the equals sign to separate an option name from its value.

       This program is part of Netpbm(1).

       pnmtopalm reads a PNM image as input, from Standard Input or pnmfile and produces a Palm Bitmap as output.

       Palm  Bitmap  files  are  either grayscale 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 pnmquant or pnmremap before you pass it to pnm-
       topalm.  Netpbm comes with several colormap files you can  use  with  pnmremap  for  this  purpose.   They  are  (4  shades  of  gray  for a depth of 2), (16 shades of gray for a depth of 4), and (232 colors in default Palm colormap).  In a standard Netpbm  installation,  these  are  in  the
       Netpbm data directory, and you can find the Netpbm data directory with a netpbm-config --datadir shell command.


         pnmremap myimage.ppm \
                  -mapfile=$(netpbm-config --datadir)/ \
         | pnmtopalm -depth=2 >myimage.palm

   Palm Bitmap Version
       pnmtopalm generates a Version 0, 1, 2, or 3 Palm Bitmap.  It generates the oldest (lowest) version it  can  for
       the given image and the options you specify.

       ?      If you specify a density (-density option) higher than 'low,' the version is at least 3.

       ?      If you specify transparency (-transparent option) or any compression, the version is at least 2.

       ?      If you specify a custom colormap (-colormap option), the verison is at least 1.

       ?      If  the  image  has more than one bit per pixel, the version is at least 1.  The image has more than one
              bit per pixel if you specify it with -depth or if you let it default and the image  has  more  than  two
              colors (or shades of gray).

       All  releases of Palm OS can read a Version 0 bitmap.  Palm OS 3.0 and later can read a Version 1 bitmap.  Palm
       OS 3.5 and later can read a Version 2 bitmap.  To read a Version 3 bitmap, you need Palm OS Garnet or  a  hand-
       held running the High Density Display Feature Set.

              Display the format of the output file.

              Produce  a  file  of  depth N, where N must be either 1, 2, 4, 8, or 16.  Because the default Palm 8-bit
              colormap is not grayscale, if the input is a grayscale or monochrome image, 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  format  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 out-
              put will always be 16-bit direct color.

              Set  the  nextDepthOffset field in the palm file header to indicate the end of the file (and pad the end
              of the file to 4 bytes, since nextDepthOffset can point only to 4 byte boundaries).

              A palm image file can contain multiple renditions of the same image, with different color depths,  so  a
              viewer  can choose one appropriate for the display.  The nextDepthOffset field tells where in the stream
              the next rendition begins.

              pnmtopalm creates a file that contains only one image, but you can separately concatenate multiple  one-
              image  files  to  create  a  multi-image  file.   If you do that, you'll need to use -offset so that the
              resulting concatenation is a correct stream.

              By default (if you don't specify -offset), pnmtopalm generates a nextDepthOffset field that  says  there
              is no following image (and does not add any padding after the image).

              Version 3 Palm Bitmaps actually have a nextBitmapOffset field instead of the nextDepthOffset.  The fore-
              going applies to whichever is relevant.

              The -offset option was new in Netpbm 10.26 (January  2005).   Before  that,  pnmtopalm  always  set  the
              nextDepthOffset field to 'none.'

              Before Netpbm 10.27 (March 2005), you cannot use -offset if you create a compressed raster (because pnm-
              topalm isn't smart enough to be able to know the size of the image at the time it  writes  the  header).
              You also cannot use it with 16 bit color depth or with the -colormap option, for much the same reason.

              This  option tells pnmtopalm to put in the stream, after after the image, a dummy image header to intro-
              duce subsequent high density images.

              This dummy image header is a special sequence specified in Palm Bitmap specifications.  It looks  to  an
              older  Palm Bitmap interpreter like an invalid image header, so such an intepreter will stop reading the
              stream there.  But a new Palm Bitmap interpreter recognizes it for what it is (just something  to  choke
              an  old  interpreter) and skips over it.  Presumably, you will add to the stream after this high density
              images which would confuse an older interpreter.

              If you specify -withdummy, you must also specify -offset, since it doesn't make any sense otherwise.

              -withdummy was new in Netpbm 10.27 (March 2005).

              Build a custom colormap and include it in the output file.  This is not recommended by Palm,  for  effi-
              ciency reasons.  Otherwise, pnmtopalm uses the default Palm colormap 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.  Transparency works only
              on Palm OS 3.5 and higher.

              Specifies that the output Palm bitmap will use the Palm scanline compression scheme.  Scanline  compres-
              sion works only in Palm OS 2.0 and higher.

              Specifies  that  the output Palm bitmap will use the Palm RLE compression scheme.  RLE compression works
              only with Palm OS 3.5 and higher.

              Specifies that the output Palm bitmap will use the Palm packbits compression scheme.  Packbits  compres-
              sion works only with Palm OS 4.0 and higher.

              This option was new in Netpbm 10.27 (March 2005).

              This  specifies the Palm Bitmap density.  The density is a number that is proportional to the resolution
              the image should have when displayed.  The proportionality factor is up to whatever is  doing  the  dis-
              playing, but it's helpful to think of these numbers as being pixels per inch.  The allowable values are:

       ?      72

       ?      108

       ?      144

       ?      216

       ?      288

              This option was new in Netpbm 10.27 (March 2005).  Earlier Netpbm could  not  generate  Version  3  Palm
              Bitmaps, so there was no such thing as density.

       palmtopnm(1), pnmquant(1), pnmremap(1), pnm(1)

       Palm  Bitmaps may contains multiple renditions of the same bitmap, in different depths.  To construct an N-mul-
       tiple-rendition Palm Bitmap with pnmtopalm, first construct renditions 1 through N-1 using the -offset  option,
       then  construct  the Nth image without the -offset option.  Then concatenate the individual renditions together
       in a single file using cat.

       If you will include both high density and low density renditions, put the high density images last and when you
       create the last of the low density images, use the -withdummy option.

       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 function.  Copyright 1995-2001 by Ian Gold-
       berg, George Caswell, and Bill Janssen.

netpbm documentation            05 October 2003       Pnmtopalm User Manual(0)