Infotopam User Manual(0)

NAME

infotopam - convert Amiga .info icons to PAM

SYNOPSIS

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.

EXAMPLES

By default, infotopam converts the first icon in a .info file:
    infotopam amiga.info > 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.info > amiga.second.pam

Use the -forcecolor option to force color conversion for a 1 bit-plane .info file:
    infotopam -forcecolor bw.info > 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.info > icon.pam

Since Amiga monitors do not use square pixels, some icons may appear squished. Filtering the output through pamscale can fix this:
     infotopam squish.info | pamtopnm | pamscale -yscale 1.7 > normal.pnm

DESCRIPTION

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.

OPTIONS

-forcecolor

    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
      below).

-numcolors numcolors

    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 ppm_parsecolor() argument (libppm.html#colorname) .

-selected

    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.

SEE ALSO

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

NOTES

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!

HISTORY

infotopam was new in Netpbm 10.22 (April 2004).

LIMITATIONS

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.

AUTHOR

Copyright (C) 2000, 2004 by Richard Griswold.