Iconizer: Contrast |
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As a point is iterated around the screen the hits upon any given pixel are counted. The more hits on a pixel the brighter Iconizer makes the pixel. However, Iconizer cannot know how dispersed the image is about the screen. If less points are visited more frequently the resulting image may be too bright. It will seem bleached out. Conversely, if more points are visited less often the final image may seem too dark. The Contrast control allows an image to be replotted using more or less iterations to compensate for this.
By default, AutoContrast is switched on. This allows Iconizer to iterate faster. When an image is too light or dark first turn off the AutoContrast. The manual control will spring into life and can be used to increase or decrease the percentage of iterations to be used. After setting the contrast, look back at the Grey map window or Colour map window. Observe that the number of iterations will have been altered depending upon the percentage set. Also, the estimated time to generate the image will be different accordingly.
In practice the Contrast control is mostly not required. When it is used, don't forget to turn AutoContrast back on once it is no longer required so that Iconizer can iterate faster.
Note that if an image is particularly small on the canvas, or particularly big, this will alter the number of hits on the most hit pixel. The correct responce to this is to adjust Scale in the Icon data window to correctly size the image on the canvas. Iconizer is not intended for zooming in on parts of an image. This is because to see the symmetry on average the whole of the strange attractor needs to be shown. In this respect, strange attractors are fundamentally different to fractals and the mandelbrot set.
On the next page a large sample image will give a flavour of what Iconizer can achieve.
Incidentally, a very fast and powerful tool for investigating the Mandelbrot set is also available from The MathMagical Software Company.
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