Hi, My first plug-ins, but the writing seemed straight-forward enough. I categorized them both as colormap (<Image>/Filters/Colors under GIMP v1.0). "Mandelbrot Invert 1" inverts image pixels to display a view of the Mandelbrot set, generated within a user-selected rect of the complex plane. If a sampled point within the rect is found to be a member of the M-set, the color/value of the corresponding image pixel is inverted. "Mandelbrot Invert 2" inverts image pixels to display encirclement bands, generated within a user-selected rect of the complex plane, that usually appear adjacent the to Mandelbrot set. The lower the number of iterations required for the series sum calculated for a sampled point to diverge beyond threshold, the more the color/value of the corresponding image pixel is inverted. Some samples of digital art I created using the algorithm for the first plug-in (as a stand-alone program, before incorporation into the plug-in) are viewable online in the Spotlight Corner of the Fractal Art Museum <http://www.crosswinds.net/~fractalis/spot/kodstans.html>. Thanks to Joseph Trotsky for his generous comments. A coherent and accessible write-up of the theory behind the Mandelbrot Set is available in Gary William Flake's book, "The Computational Beauty of Nature." This book was the starting point and inspiration for much of this work. Usage suggestions: Both "Mandelbrot Invert 1" and "Mandelbrot Invert 2" start with a square rect by default. To get a more accurate depiction of the Mandelbrot set (which may or may not be important to you), you should set the height/width proportions of the complex plane rect to be the same as the height/width proportions of your image or selection. If it's not clear how to use the first four parameters to resize/rescale/reposition the rect, try doubling or cutting the default values in half to see the effect. As far as the other two parameters of "Mandelbrot Invert 2," experiment. If you go outside my suggested bounds, it shouldn't break anything (if it does, let me know), but shouldn't output anything interesting either. Note also that unlike most color filters, these also work on grayscale images. It's possible to get interesting abstract mist effects by decomposing an image, applying one of the "Mandelbrot Invert" filters to the saturation channel, and recomposing. That's it. Feedback, software development suggestions for fixes/improvement, or interesting art use ideas/examples appreciated. Later, Stan Schwartz ********************************************************************** * Stan Schwartz * * Post-Conceptual and Computational Art * * stan@xxxxxxxxxxxxxxxxxxxxxxxxx * * <http://www.stanschwartzmeta-arts.com> * * * * * * "Nothing is true and everything is permitted." * * William Burroughs * * * * "All profoundly original art looks ugly at first." * * Clement Greenberg * * * * "The Net treats censorship as damage and routes around it." * * John Gilmore * **********************************************************************
