This zoom into the parent of Jim's FOTD for August 4th, 2013: http://www.emarketingiseasy.com/TESTS/FOTD/2013/F130804W.jpg was under-iterated when I used Jim's FOTD maxiter of 1,000. Here's the same fractal with maxiter=10,000: http://www.emarketingiseasy.com/TESTS/FOTD/2013/F130804V.jpg Method for Comparing the Differences Between Two Images ------------------------------------------------------- Here's a nifty way to compare the difference between two different versions of a fractal or other pair of similar images: Put the two different images into adjacent tabs in your browser. I do this by right clicking each link and choosing "Open link in new tab". If your browser has scaled the images down to fit your browser window, click the upper left corner of each image once -- to keep your browser from resampling (and possibly repositioning) the images. Then quickly alternate between viewing each of the two images in their respective tabs. This lets you see differences in the images quite clearly, by using the eye's sensitivity to motion. Many browsers accept the key combination <ctrl><n> to view their <n>th tab. Using the keyboard allows you to not have to move your gaze away from the images to aim your cursor at each of the two tabs to click on them. I'm able to hold down the <ctrl> key and alternately press the "3" and "4" keys (or wherever the two tab's locations are) to "blink" back and forth between viewing each of the two different images. The differences between the images literally jump out at you. I got this idea from the method used by Clyde Tombaugh to discover Pluto. He blinked between viewing two different photographic plates of the night sky taken on successive nights. Pluto moved as the photos were blinked. The instrument he used to do this is called a "blink microscope." This "blink" method is not limited to fractal image comparison. It can be used to compare of any pair of images with slight differences. For example, one could compare the change in quality of two or more versions of the same image saved with differing amounts of JPEG compression. If you're a member of the [Fractint] email list serve, please let me know whether you're able to "blink" a pair of images from my description above. Thanks, - Hal Lane ######################## # hallane@earthlink.net ########################