Zerene focus stacker12/9/2023 Sometimes the easiest way to deal with a troublesome area is to stack just the input files with that area in focus, then use the retouching tool to merge that output image with an output image for the full stack. In particularly troublesome cases, it can be helpful to run DMap two or more times with different parameter settings, and combine those results with retouching. The very best values for these parameters must be determined by experiment, since they depend on many factors such as magnification, lighting, camera, and lens settings in addition to the type of subject. Typically the smoothing radius should be about half the estimation radius. Subjects that have simple shapes and a lack of sharp detail will benefit from higher settings (larger radii), while subjects that have unusually crisp, high contrast detail may benefit from lower settings (smaller radii). The default settings are appropriate for typical conditions. The best settings for these depend on the nature of your images. This can be done quickly and easily from a PMax output, as shown in the retouching tutorial.įor simpler subjects, DMap by itself with a carefully set threshold will often give final quality results.ĭMap results are also affected by two parameters named Estimation Radius and Smoothing Radius, which can be set in Options > Preferences > DMap Settings. With this difficult subject, there is still some halo that must be dealt with by retouching. The DMap output from Percentile: 55.0 is shown below. If the result is not ideal, then repeat the process, using a different setting of the slider.įor example if there are blotches in background near the subject, then expand the black mask to cover those blotches, by moving the slider slightly to the right. When the threshold is set properly, click the OK button and wait for the computation to finish. With the contrast threshold set to an intermediate level, the junk has mostly disappeared, while most of the subject detail is still retained. With the contrast threshold set at Percentile: 85.0, the junk has mostly disappeared, but a lot of subject detail has disappeared also. In other subjects, we might see unacceptable “chunky” regions even in the body of the subject. With the contrast threshold set at Percentile: 0.0, we can see a large amount of “junk” around the edge of the subject. In that case the best results are obtained by using human judgment and the retouching tool to combine the best aspects of both algorithms.Ĭomputation: the depth map is refined based on the contrast threshold, and from that map, the final image is constructed. For particularly challenging subjects like bugs and flowers shot through microscope objectives, neither method is ideal by itself. Some types of subjects look good when they are processed automatically by PMax, but not by DMap. It does a better job keeping the original smoothness and colors, but it's not as good at finding and preserving detail. But PMax tends to increase noise and contrast, and it can alter colors somewhat.ĭMap is a “depth map” method. It's also very good at handling overlapping structures like mats of hair and crisscrossing bristles, nicely avoiding the loss-of-detail halos typical of other stacking programs. It is very good at finding and preserving detail even in low contrast or slightly blurred areas. To get the most benefit from using Zerene Stacker, it’s important to understand the differences between its two major stacking methods.
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