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Infotopam User Manual(0) Infotopam User Manual(0)


infotopam - convert Amiga .info icons to PAM


infotopam [-forcecolor] [-numcolors numcolors] [-selected] [index color ...] [filename]

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.


By default, infotopam converts the first icon in a .info file:

infotopam > amiga.first.pam

Use the -selected option to convert the second icon in a .info file. Here infotopam reads from Standard Input:

infotopam -selected < > amiga.second.pam

Use the -forcecolor option to force color conversion for a 1 bit-plane .info file:

infotopam -forcecolor > bw.pam

Use -numcolors to override colors for indexes 0 and 3. Notice the two ways to specify the color:

infotopam -numcolors 2 0 green 3 #FF0000 > icon.pam

Since Amiga monitors do not use square pixels, some icons may appear squished. Filtering the output through pamscale can fix this:

infotopam | pamtopnm | pamscale -yscale 1.7 > normal.pnm


This program is part of Netpbm(1).

infotopam converts an Amiga .info (icon) file to a PAM image. infotopam reads a .info file from filename, or from Standard Input if you do not specify a file name, and writes the converted PAM image to Standard Output.

infotopam currently handles 1 and 2 bit-plane icons. If the .info icon only has 1 bit-plane, infotopam generates a bitmap (black&white) PAM image; otherwise it generates a color PAM image. You can force infotopam to convert 1 bit-plane images to color PAM images by using the -forcecolor option.


In addition to the options common to all programs based on libnetpbm (most notably -quiet, see
Common Options
), infotopam recognizes the following command line options:

Forces infotopam to convert 1 bit-plane icons to color PAM
images instead of bitmap PAM images. infotopam uses the index 2
color for black and the index 1 color for white (more on this

Tells infotopam how many colors to override. Pixels in the
Amiga .info files are assigned an index value rather than a specific color.
The standard colors for a 2 bit-plane icon are:

Index 0: Blue (00, 55, AA)
Index 1: White (FF, FF, FF)
Index 2: Black (00, 00, 20)
Index 3: Orange (FF, 8A, 00)

To override the colors, first specify how many colors to override using
-numcolors, then specify an (index color) pair for each color
you want to override, where index is a value from 0 to 3 and
color the new color for that index. Specify color as
described for the pnm_parsecolor() argument .

Tells infotopam to convert the selected (second) icon instead of
the normal (first) icon. Each Amiga .info icon file contains two icon
images. The first image is the normal, unselected icon, and the second
image is the selected icon. By default infotopam converts the first
icon. You can tell infotopam to convert the second icon by using the
-selected option.

All options can be abbreviated to their shortest unique prefix.


pam(5) pamtopnm(1) pamscale(1)


Thanks to the following people on comp.sys.amiga.programmer for tips and pointers on decoding the info file format:

  • Ben Hutchings
  • Thomas Richter
  • Kjetil Svalastog Matheussen
  • Anders Melchiorsen
  • Dirk Stoecker
  • Ronald V.D.

The format of the Amiga .info file is as follows:

DiskObject header 78 bytes
Optional DrawerData header 56 bytes
First icon header 20 bytes
First icon data Varies
Second icon header 20 bytes
Second icon data Varies

The DiskObject header contains, among other things, the magic number (0xE310), the object width and height (inside the embedded Gadget header), and the version.

Each icon header contains the icon width and height, which can be smaller than the object width and height, and the number of bit-planes.

The icon data has the following format:

BIT-PLANE planes, each with HEIGHT rows of (WIDTH
+15) / 16 * 2 bytes length.

So if you have a 9x3x2 icon, the icon data will look like this:

aaaa aaaa a000 0000
aaaa aaaa a000 0000
aaaa aaaa a000 0000
bbbb bbbb b000 0000
bbbb bbbb b000 0000
bbbb bbbb b000 0000

where a is a bit for the first bit-plane, b is a bit for the second bit-plane, and 0 is padding. Thanks again to Ben Hutchings for his very helpful post!


infotopam was new in Netpbm 10.22 (April 2004).


infotopam currently only handles 1 and 2 bit-plane icons.

There is no pamtoinfo command, since the .info files contain a lot more than just icon data, and mapping the colors would be difficult.


Copyright (C) 2000, 2004 by Richard Griswold.


This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at
07 April 2004 netpbm documentation