\ .\" This man page was generated by the Netpbm tool 'makeman' from HTML source. .\" Do not hand-hack it! If you have bug fixes or improvements, please find .\" the corresponding HTML page on the Netpbm website, generate a patch .\" against that, and send it to the Netpbm maintainer. .TH "Pnmtopalm User Manual" 0 "25 August 2017" "netpbm documentation" .SH NAME pnmtopalm - convert a PNM image to a Palm Bitmap .UN synopsis .SH SYNOPSIS \fBpnmtopalm\fP [\fB-verbose\fP] [\fB-depth=\fP\fIN\fP] [\fB-maxdepth=\fP\fIN\fP] [\fB-colormap\fP] [\fB-transparent=\fP\fIcolorspec\fP] [\fB-density=\fP\fIN\fP] [\fB-offset\fP] [\fB-withdummy\fP] [\fB-scanline_compression\fP | \fB-rle_compression\fP | \fB-packbits_compression\fP] [\fIpnmfile\fP] .PP 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. .UN description .SH DESCRIPTION .PP This program is part of .BR "Netpbm" (1)\c \&. .PP \fBpnmtopalm\fP reads a PNM image as input, from Standard Input or \fIpnmfile\fP and produces a Palm Bitmap as output. .PP Palm Bitmap files are either grayscale files with 1, 2, or 4 bits per pixel, or mapped color files with 8 bit per pixel, or a direct color file with 16 bits per pixel, and \fBpnmtopalm\fP chooses this color depth based on the maxval and number of colors in the input, unless you specify a depth (bits per pixel) with \fB-depth\fP. You can also specify a maximum depth with \fB-maxdepth\fP to partially constrain \fBpnmtopalm\fP's choice. Input files must have an appropriate number and set of colors for the selected output constraints. .PP This often means that you should run the PNM image through \fBpnmquant\fP or \fBpnmremap\fP before you pass it to \fBpnmtopalm\fP. Netpbm comes with several colormap files you can use with \fBpnmremap\fP for this purpose. They are \fIpalmgray2.map\fP (4 shades of gray for a depth of 2), \fIpalmgray4.map\fP (16 shades of gray for a depth of 4), and \fIpalmcolor8.map\fP (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 \fBnetpbm-config --datadir\fP shell command. .PP Example: .nf pnmremap myimage.ppm \e -mapfile=$(netpbm-config --datadir)/palmgray2.map \e | pnmtopalm -depth=2 >myimage.palm .fi .PP Compressed Palm Bitmap files, at least the ones \fBpnmtopalm\fP knows how to create, cannot have more than 8 bits per pixel. \fBpnmtopalm\fP defaults to 8 bits per pixel if you specify a compressed output. You can specify the number of bits per pixel explicitly with \fB-depth\fP. \fB-maxdepth\fP has the same effect as \fB-depth\fP. If you specify more than 8 bits per pixel with either of these, \fBpnmtopalm\fP fails. .UN version .SS Palm Bitmap Version .PP \fBpnmtopalm\fP 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. .IP \(bu If you specify a density (\fB-density\fP option) higher than "low," the version is at least 3. .IP \(bu If you specify transparency (\fB-transparent\fP option) or any compression, the version is at least 2. .IP \(bu If you specify a custom colormap (\fB-colormap\fP option), the version is at least 1. .IP \(bu 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 \fB-depth\fP or if you let it default and the image has more than two colors (or shades of gray). .PP 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 Set. .UN options .SH OPTIONS .TP \fB-verbose\fP Display the format of the output file. .TP \fB-depth=\fP\fIN\fP Produce a file of depth \fIN\fP, where \fIN\fP 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. .TP \fB-maxdepth=\fP\fIN\fP Produce a file of minimal depth, but in any case less than \fIN\fP bits wide. If you specify 16-bit, the output will always be 16-bit direct color. .TP \fB-offset\fP Set the \fBnextDepthOffset\fP field in the palm file header to indicate the end of the file (and pad the end of the file to 4 bytes, since \fBnextDepthOffset\fP can point only to 4 byte boundaries). .sp 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 \fBnextDepthOffset\fP field tells where in the stream the next rendition begins. .sp \fBpnmtopalm\fP 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 \fB-offset\fP so that the resulting concatenation is a correct stream. .sp By default (if you don't specify \fB-offset\fP), \fBpnmtopalm\fP generates a \fBnextDepthOffset\fP field that says there is no following image (and does not add any padding after the image). .sp Version 3 Palm Bitmaps actually have a \fBnextBitmapOffset\fP field instead of the \fBnextDepthOffset\fP. The foregoing applies to whichever is relevant. .sp The \fB-offset\fP option was new in Netpbm 10.26 (January 2005). Before that, \fBpnmtopalm\fP always set the \fBnextDepthOffset\fP field to "none." .sp Before Netpbm 10.27 (March 2005), you cannot use \fB-offset\fP if you create a compressed raster (because \fBpnmtopalm\fP 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 \fB-colormap\fP option, for much the same reason. .TP \fB-withdummy\fP This option tells \fBpnmtopalm\fP to put in the stream, after the image, a dummy image header to introduce subsequent high density images. .sp 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 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 interpreter) and skips over it. Presumably, you will add to the stream after this high density images which would confuse an older interpreter. .sp If you specify \fB-withdummy\fP, you must also specify \fB-offset\fP, since it doesn't make any sense otherwise. .sp \fB-withdummy\fP was new in Netpbm 10.27 (March 2005). .TP \fB-colormap\fP Build a custom colormap and include it in the output file. This is not recommended by Palm, for efficiency reasons. Otherwise, \fBpnmtopalm\fP uses the default Palm colormap for color output. .TP \fB-transparent=\fP\fIcolorspec\fP Marks \fIone\fP particular color as fully transparent. .sp \fIcolorspec\fP is as described for the .UR libppm.html#colorname argument of the \fBppm_parsecolor()\fP library routine .UE \&. .sp Transparency works only on Palm OS 3.5 and higher. .TP \fB-scanline_compression\fP Specifies that the output Palm bitmap will use the Palm scanline compression scheme. Scanline compression works only in Palm OS 2.0 and higher. .TP \fB-rle_compression\fP Specifies that the output Palm bitmap will use the Palm RLE compression scheme. RLE compression works only with Palm OS 3.5 and higher. .TP \fB-packbits_compression\fP Specifies that the output Palm bitmap will use the Palm packbits compression scheme. Packbits compression works only with Palm OS 4.0 and higher. .sp This option was new in Netpbm 10.27 (March 2005). .TP \fB-density\fP=\fIN\fP 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 displaying, but it's helpful to think of these numbers as being pixels per inch. The allowable values are: .IP \(bu 72 .IP \(bu 108 .IP \(bu 144 .IP \(bu 216 .IP \(bu 288 .sp 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. .UN seealso .SH SEE ALSO .BR "palmtopnm" (1)\c \&, .BR "pdbimgtopam" (1)\c \&, .BR "pnmquant" (1)\c \&, .BR "pnmremap" (1)\c \&, .BR "pnm" (5)\c \& .UN notes .SH NOTES .PP Palm Bitmaps may contains multiple renditions of the same bitmap, in different depths. To construct an N-multiple-rendition Palm Bitmap with \fBpnmtopalm\fP, first construct renditions 1 through N-1 using the \fB-offset\fP option, then construct the Nth image without the \fB-offset\fP option. Then concatenate the individual renditions together in a single file using \fBcat\fP. .PP 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 \fB-withdummy\fP option. .PP If you specify the Palm packbits compression scheme for a 16-bit direct color bitmap, this program generates an invalid bitmap. .UN authors .SH 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 function. Copyright 1995-2001 by Ian Goldberg, George Caswell, and Bill Janssen. .SH DOCUMENT SOURCE This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at .IP .B http://netpbm.sourceforge.net/doc/pnmtopalm.html .PP