Useful structures typically include isolated, bright stars, close pairs or triplets of equally bright stars, compact star clusters, bright gas nebulae, etc. In order to identify control points common to both images you will need to identify suitable and conspicuous structures that the algorithm can easily identify in both images. Then select the first image from the drop-down list on the left-hand side and the second image from the list on the right-hand side. To begin the process, navigate to the “Control Points” tab. This is the most time-consuming part of the entire process and can take more than an hour if a larger number of images (> 20) needs to be stacked. Therefore, control points will have to be set manually in every single image. When dealing with astrophotos, however, the automatic control point algorithm will usually fail, because there are too many stars in the image that all look the same and will confuse the algorithm. When stitching a terrestrial panorama, Hugin can automatically find such structures, called “control points”. In order for Hugin to know how to correct and shift the individual images, the software needs to identify individual structures that are visible in all images. Ensure that only images showing the same part of the sky are loaded. Alternatively, you can go to the “Images” tab and click the “Add individual images.” button. Once Hugin has started, navigate to the tab labelled “Assistant” and click on the “Load images.” button to load all your images into the software. This allows the alignment and stacking of images that were taken without a tracking mount. In principal, Hugin can also correct, shift, and rotate the individual exposures. This is useful whenever several exposures of the the same region of the sky need to be stacked in an attempt to create a single image with high signal-to-noise ratio and high dynamic range. This page explains how to stack astrophotos with the panorama stitching software Hugin. I will keep this page online, though, in the hope that some of the information may still be useful. Note: The instructions on this page have already become obsolete as a result of significant changes in the user interface of Hugin. Website of Tobias Westmeier - Astronomy - Stacking Astrophotos with Hugin Website of Tobias Westmeier Navigation
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