Attconv is a command-line tool that takes the .txt files created by
Attractors.jar and renders them as .tga (Truevision Targa) images. It may
be invoked at a command prompt like this:

attconv example.txt [options]

The output image is named for the input text file; for the above the
output file would be called example.tga. Unlike in the java app, the
attractors are automatically centred and scaled to fill the image.

Additionally, attconv can take the following options:

-in where n is the number of iterations to be used for the calculation.
The higher this number, the smoother the fractal will look. If not
specified, the default is 1e6, or 1,000,000. Iterations can be specified as
integer literals (e.g. '1000000') or as float literals (e.g. 2e8).
Negative/small values and excessively large values are ignored and the
default used instead.

-cn where n is the colour map number to be used. There are
currently 5 colour maps that can be used: 0 = greyscale, 1 =
red-green-blue, 2 = white-yellow-red, 3 = white-yellow-blue, 4 =
red-purple-pink. If not specified, the default is 1.

-bn where n is 0, 1 or 2, the brightness mapping function to be used.
Mapping 0 gives a low-contrast, bright mapping, 2 gives a 
high-contrast, thin look to the shape, and 1 is somewhere in 
between. If not specified, the default is 0.

-sn where n is the size in pixels of the square image generated. If not
specified, the default is 800.