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gp2jam.txt
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1996-08-18
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GP2JAM - Grand Prix 2 JAM to BMP Converter
Copyright (c) 1996 Trevor Kellaway (100331.2330@compuserve.com)
V1.0 18th Aug 1996
Introduction
------------
Grand Prix 2 (GP2) from Microprose stores its image files in a unique format,
these files have the extension '.JAM' (referred to as 'JAM' files).
GP2JAM is a DOS program which converts GP2 JAM files to .BMP files and back
again. You will find these images in \GP2\GAMEJAMS\ on your hard disk (or
CD-ROM drive).
This version of GP2JAM supports the car image JAM files, thus you can convert
from a WILLIAMS.JAM file to a WILLIAMS.BMP. You can now use your favourite
bitmap editor to modify the image and save it. Next you would convert the
WILLIAMS.BMP back to WILLIAMS.JAM.
Installation
------------
This distribution should include the following files:
GP2JAM.TXT A text version of the help file.
GP2JAM.HTM An HTML version of the help file.
GP2JAM.EXE The converter program.
Copy GP2JAM.EXE to any directory on your hard disk, I recommend that you
create a new directory (say '\JAM'), you can then keep all your updated JAMs
and BMPs there without cluttering up the game directories (this also allows
you to reinstall the game without losing your images).
Quick Start
-----------
Here is a quick tutorial on how to start painting the Williams.
Change directory to where you put GP2JAM.EXE ('\JAM'). Convert the Williams
JAM file to a bitmap by typing the following at a DOS command prompt:
GP2JAM -j\GP2\GAMEJAMS\WILLIAMS.JAM
This should create a WILLIAMS.BMP in the current directory (Note: If the game
is stored on a different drive then add the appropriate drive letter at the
front of the filename).
Now startup your favourite bitmap editor (Paint Shop Pro is a good one, much
better than Windows/W95 Paintbrush) and load the WILLIAMS.BMP. You should see
a picture of the different panels of the car. Paint the car and then save
the WILLIAMS.BMP again.
Now back at the DOS prompt convert the file back to a JAM:
GP2JAM -bWILLIAMS.BMP -j\GP2\GAMEJAMS\WILLIAMS.JAM
That should be it. Startup GP2 and admire your work!
Important
---------
All of the JAM files have a unique identity (ID) encoded in them so you can't
copy a WILLIAMS.JAM over the top of say a BENETTON.JAM, you will get a
transparent car! GP2JAM will always display the actual JAM ID when converting
to help you identify which file you are manipulating, this only becomes useful
if you start renaming the JAM files in your directory (don't rename the games
JAM files!).
Usage
-----
GP2JAM [-h?v] [-y] [-bFILENAME.BMP] [-jFILENAME.JAM]
-h|-? Display this usage message.
-v Display the version number & contact information.
-jFNAME.JAM Set the JAM filename to be 'FNAME.JAM'.
-bFNAME.BMP Set the BMP filename to be 'FNAME.BMP'.
-y Automatically answer all questions with 'Yes'.
When converting from a JAM to BMP you need only specify the JAM filename:
GP2JAM -jWILLIAMS.JAM
This will automatically create a WILLIAMS.BMP (based on the JAM ID), if the
WILLIAMS.BMP file already exists you will be asked if you wish to overwrite
it. You can turn off these prompts by using the '-y' option which will
automatically respond 'Yes' to all prompts.
If you wanted to use a different bitmap filename specify it after the JAM
filename:
GP2JAM -jWILLIAMS.JAM -bCAR1.BMP
To convert back from a BMP to a JAM file you must specify both filenames and
the BMP filename must be first:
GP2JAM -bWILLIAMS.BMP -jWILLIAMS.JAM -y
This will update the existing WILLIAMS.JAM file (Note: the '-y' option was
present to automatically respond to the overwrite prompt).
You can display the usage message by starting GP2JAM either with no command
line options, or use either '-?', or '-h'.
To find out which version of GP2JAM you have use the '-v' option, this also
displays the author's E-mail address and web site URL.
Bitmaps and Palettes
--------------------
When you first convert an original game JAM file GP2JAM may display the
following warning:
'Warning: The image contains unique colours which can't be mapped to GP2JAM's
standard palette, these will be mapped to the nearest colour available.'
Don't worry about this, GP2JAM uses a different fixed palette to that of the
cars in the game and maps the game colours to the nearest available ones in
its palette. When you perform a later update of a car you've edited previously
you won't get this warning.
When saving the BMP image don't change the colour depth (256) or change the
image size. You can use any of the colours from the fixed palette (the first
192) but *don't* change the palette as this is fixed by the game and the BMP
just contains a copy (changing the palette won't have any effect in the game).
Make sure you save the bitmap RGB encoded (not RLE or OS/2 encoded).
Don't over paint the background (dull green) colour or move any of the car
parts. A good way to paint large areas is to use the selective colour eraser
tool which is available in most good painting packages.
The BMP has several small rectangles which are all one colour, these are the
suspension arms.
Known Problems
--------------
GP2JAM has been tested with the European GP2 V1.0b and works fine in VGA and
SVGA. It should also work for the other language versions but I haven't tried
these yet.
This version of GP2JAM currently only supports the car JAM files.
The cockpit view from a car will display the original game colour as this
information seems to be encoded in the GP2.EXE file rather than the car JAM
file.
Car Sets
--------
Please *don't* send me the results of your painting, I'll get swamped with
file E-mails otherwise! I won't be producing any car sets (I just write the
converter, I never actually use it!), but I'm sure some good ones will quickly
be available on the web.
Checkout Dave Gymer's web site and this will probably soon have some
links on it:
http://www.gamesdomain.co.uk/dgymer/f1gp/
ftp://www.gamesdomain.co.uk/pub/users/dgymer/f1gp/
Note: The JAM files don't compress at all, so if possible when creating a car
set include the BMP files as they do compress (I recommend you create a
JAMS.ZIP and a BMP.ZIP then the downloader can choose which one to download,
the BMP.ZIP will be much smaller than the JAMS.ZIP).
Future Updates
--------------
The next version of GP2JAM will support the driver's helmets.
Subsequent versions may support the advertising boards and possibly other
objects around the track. Keep an eye on my web page.
History
-------
V1.0 18th Aug 1996 Initial version.
Only supports car JAM files.
E-mail / Further Info
---------------------
Please send any suggestions, comments, or bug reports (include the version
of GP2JAM you are using) to the author Trevor Kellaway at:
CompuServe: [100331,2330]
Internet: 100331.2330@compuserve.com
The current version of GP2JAM will always be available on my web page along
with the current version of this help file.
http://ourworld.compuserve.com/homepages/tkellaway/
It should also be available on Compuserve in GO SPRTSIMS, Lib #14 (Racing
Circuits) as GP2JAM.ZIP.
This program may be freely copied and distributed, as long as it is not
modified in any way, no fee is charged and this file is always included.
This program is provided "as is" with no warranties expressed or implied.
The author will not be held responsible for any losses incurred, either
directly or indirectly by the use of this program.
This is *not* an Microprose product. If you have problems with the game then
try it without using this program.
The author has no connection with Geoff Crammond or Microprose.
<<End of document>>