You can change all the fractal's parameters from here. Width and Height should set the size of the image in pixels, but don't actually do anything at the moment. Max Iterations sets the number of iterations a point will go through before we give up and assume it's a member of the Julibrot. If Auto Deepening is on, the maximum number of iterations is set automatically by Gnofract 4D but you can change it by hand whenever you like. If a point's magnitude ever exceeds the Bailout value, we stop iterating. If you set this less than 4, the results won't be mathematically correct, but can look interesting. If Antialias is on, the image takes about five times as long to draw, but looks smoother and nicer. The fractal can be drawn using either a Color Range or a Color Map. Color Ranges are based on a single base color, but produce a whole rainbow of other colors as well. You'll need to experiment a bit to get a feel for how it works. Color Maps are pregenerated palette files taken from Fractint. Continuous Potential gives a much smoother image, by basing the color not only on how many iterations the point took to escape, but on how far away from the origin it ended up on its last iteration. The Location entryboxes allow you to change the coordinates of the screen center and the image size. The Angles tab allows you to set the rotation angles. Only values between 0 and 2 * pi are different; values outside this range "wrap" to points inside that range.