Julia set renderer in Python using PIL.
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Julia Set renderer

Julia set renderer in Python using PIL.

Sample image

(more samples can be found here)


Command line

This module is intended to be used using the commandline. For example, the command used to generate the above image is: python julia.py z**2 - 0.7 + 0.27015j (actually, I specified a few extra flags as not to generate an image that fills the entire screen, but the above command will give you the same image, just at a higher resolution).

There are a lot of flags that allow you to customize the image, use python julia.py -h to find out more.

The only thing you can't specify using flags is how colors are picked based on iterations, since this process is to complex to capture in a flag. By default, a grayscale color will be picked using linear interpolation. However, you can define your own function in renderer.py, for example, the second sample uses this function:

def iterationstopixel(i):
    delta = i / iterations
    r = min(3 * delta, 1) * 256
    g = max(min(3 * delta - 1, 1), 0) * 256
    b = max(min(3 * delta - 2, 1), 0) * 256
    return int(r), int(g), int(b)

As a module

The renderer can also be used as a module. You will only need the renderer.py file to do this, julia.py acts as a cmd-wrapper for this module. Note: Python's built-in eval() function is used to evaluate the equation. Letting users specify the equation without filtering it yourself is therefore unsafe.