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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 col-
       ors for the selected output constraints.

       This often means that you should run the PNM image through pnmquant or pnmremap before you
       pass it to pnmtopalm.  Netpbm comes with several colormap files you can use with  pnmremap
       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  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


	 pnmremap myimage.ppm \
		  -mapfile=$(netpbm-config --datadir)/palmgray2.map \
	 | 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.

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

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

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

       o      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 handheld running the  High	Density  Display  Feature

	      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  mono-
	      chrome  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 output 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  con-
	      catenate	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

	      Version 3 Palm Bitmaps actually  have  a	nextBitmapOffset  field  instead  of  the
	      nextDepthOffset.	The foregoing 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	pnmtopalm  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 the image, a dummy image
	      header to introduce subsequent high density images.

	      This dummy image header is a special sequence specified in Palm  Bitmap  specifica-
	      tions.   It looks to an older Palm Bitmap interpreter like an invalid image header,
	      so such an interpreter will stop reading the stream there.  But a new  Palm  Bitmap
	      interpreter  recognizes  it  for	what it is (just something to choke an old inter-
	      preter) 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 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.  Transparency works only on Palm OS 3.5 and

	      Specifies that the output Palm  bitmap  will  use  the  Palm  scanline  compression
	      scheme.  Scanline compression 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 compression 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 propor-
	      tional to the resolution the image should have when displayed.  The proportionality
	      factor  is  up  to  whatever  is doing the displaying, but it's helpful to think of
	      these numbers as being pixels per inch.  The allowable values are:

       o      72

       o      108

       o      144

       o      216

       o      288

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

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

       Palm Bitmaps may contains multiple renditions of the same bitmap, in different depths.  To
       construct an N-multiple-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

       If you specify the Palm packbits compression scheme for a 16-bit direct color bitmap, this
       program generates an invalid bitmap.

       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 Goldberg, George Caswell, and Bill Janssen.

netpbm documentation			 05 October 2003		 Pnmtopalm User Manual(0)
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