pgmtoimgv1

Usage

Overview

pgmtoimgv is a simple filter for converting Portable Graymaps to grayscale Pilot Image Viewer pdb files. The input pgm file must use the following palette unless you specify the -4 switch:

	P3
	4 1
	255
	  0   0   0
	 85  85  85
	170 170 170
	255 255 255

if you specify -4, then your grayscale image must use this palette:

	P3
	16 1
	255
	  0   0   0
	 17  17  17
	 34  34  34
	 51  51  51
	 68  68  68
	 85  85  85
	102 102 102
	119 119 119
	136 136 136
	153 153 153
	170 170 170
	187 187 187
	204 204 204
	221 221 221
	238 238 238
	255 255 255

If your PGM file doesn't use one of these palettes, use ppmquant(1) to convert your palette.

If an image's width is not a multiple of 16 pixels, enough extra white pixels will be added at the right side to ensure alignment. Images will be padded, with white pixels, to a width and height of 160 if needed.

Options

-h

Display a short summary of the command line options and exit.

-v

Display the version and exit.

-4

Use 4 bit grayscale (16 shades of gray).

-t title

Specify the title of the image (up to 31 characters).

-n notefile

Specify the note file. No note is attached to the image by default.

-c

Produce a compressed image.

-m

Produce a compressed image if it is smaller than the uncompressed version. This is the default compression mode.

-u

Produce an uncompressed image.