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This was a test render for my improved DE coloring. The color map is to take distance d in pixels and if it is between 0 and 1 (i.e., the image pixel contains M-set boundary) base the color on



where x is a parameter. For this image x = 1. The effect is to make the spike and the tree clearly discernible, compared to using a plain linear mapping. Even so, for some similar images (such as Troubled Tree) the x parameter needs to be raised and it can still be difficult to do justice to the fractal.

Regardless, the test render came out beautiful enough for me to want to publish it.

Freely redistributable and usable subject to the Creative Commons Attribution license, version 3.0.

Detailed statistics:

Name: DE Test I
Date: January 4, 2010
Fractal: Mandelbrot
Location: A tree in elephant valley of the big spike minibrot of a spiral minibrot in Seahorse Valley.
Depth: Moderate (16 decimals)
Min Iterations: 2536
Max Iterations: 18994
Layers: 1
Anti-aliasing: 4x4, threshold 0, depth 1
Preparation time: 30 minutes, mostly coding
Calculation time: an hour and a half (2.5GHz dual-core E5200)

Thanks.