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Another nice DOF Stacker Edit
I tried putting your 3 frames though another excellent freeware utility called Picolay from http://www.picolay.de/ I ended up with far less fewer artifacts by running Picolay on its default settings. I think most of the problem could be alleviated by taking more than 3 frames for a subject such as this. But I think in this instance some of those artifacts are created by areas with too little detail to let the program discern what is and is not in good focus, so it grabs some of the areas of out-of-focus in the same regions and adds it back in. Anyway, nice tutorial and a nice addition to the CHDK archives. If you try Picolay and find it better in some regards you might want to add it to your suggested tools in the tutorial. It's far simpler to use for the beginner and a huge time-saving for the experienced user that just wants to do a quick DOF stack. Another plus is that it can actually take information from the in-focus details and construct 3D imagery pairs from 2D images. No need for special stereo software and cameras to take two images, it can do it all just from a short stack of differently focused images. It's quite interesting to play with.