Once loaded, try toggling the top layer's Alpha icon off and on. In order to be able to appreciate the minute control that the Alpha Channel can give you you'll need to load the parameter file for this image. The bottom layer is on the left, top layer on the right: The only difference between layers is the outside coloring algorithm used for each. "Plastic Peekaboo" has two layers - both layers share the same formula, location and gradient. Let's start with a Challenge 1 entry by Damien Jones. If I may suggest, read through this whole page first, then load the parameter files for all three of these images which can be found here, and then go back through the tutorial again with the images open so that you can play and experiment with them along the way. Rather than talk you through creating an image that uses the Alpha Channel, I'm going to show you three images that demonstrate different ways and reasons to use transparency. At least that is how it has worked so far for me and a few other users I've polled. With rare exceptions, I think most users experiment with the Alpha Channel after they've begun working on an image - rather than planning ahead of time to use it in a particular way. Now what's the point? I've really thought long and hard about this question while writing this tutorial. Ok, so hopefully you're starting to understand how the Alpha Channel works. Ultra Fractal Tutorial - When and Why to use the Alpha Channel
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