Hello fractitioners! I gather from postings by Sylvie Gallet and Tim Wegner that the Fracint development team is aware of this problem. I've looked long and hard at CONJAG8 as it affects MandelbrotMix4, and I believe there is no cause for alarm, the side-effects of CONJAG8 are simply that you get a totally accurate image of the reflection of your target window. I wouldn't classify this as an artifact - the detail of the image is unaffected, only its real window. Any images you have now involving MandelbrotMix4 (and its siblings) will easily be reproduced by reflecting the corners vertically, and optionally rotating the image by 180 degrees. A simple text editor macro or program could make thse changes to batches of parameter sets using the affected formulae.

From a mathematical viewpoint, this sort of error is not likely to cause widespread artifacts. Many fractals are symmetric about the imaginary axis anyway, and your original image might simply be inverted. Getting the imaginary sign wrong doesn't affect magnitudes, which are the most common form of escape conditions.

The problem with accidental reflections only becomes a nuisance if the image is not symmetric about the Y axis. Of course it is possible that we will find real artifacts in some formulae. I think they'll be quite rare, but I actually hope I find some, because that might mean finding a "lost twin" for some interesting image, and who knows what that twin is going to look like! Meanwhile, the best way to look for possibly affected formulae is to run comparison tests on a few sample images for any given formula. People can use UF or CPro, and I have my own Fractint engine emulator that I can run in debug mode, which makes it easy for me to to run a "health check" on any formula people care to nominate. I can easily test various classes of formulae to see if there is any sign of suspect behaviour. Send your requests to me! Cheers Jim White __________________________________________________ Yahoo! Plus - For a better Internet experience http://uk.promotions.yahoo.com/yplus/yoffer.html