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CentOS 5.1 |
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infotopam(1) |
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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.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
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.
-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 the new color for that index. Specify
color as
described for the
ppm_parsecolor()
argument .
-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.
pam(1) pamtopnm(1) pamscale(1)
Thanks to the following people on comp.sys.amiga.programmer for tips and pointers on decoding the info file format:
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Ben Hutchings |
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Thomas Richter |
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Kjetil Svalastog Matheussen |
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Anders Melchiorsen |
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Dirk Stoecker |
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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.
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infotopam(1) | |