Stacking types: Aligned stars vs. Star trails
In Nebulb there are two types of stacking that generate two different types of images: aligned stars and star trails.
- Aligned stars: In this case Nebulb, before stacking, performs an alignment of the stars of all the images with the image selected as base, so that the result is an image with all the stars as they were in the base image, but without noise. In a way this type of stacking is like a kind of a software star tracking mount, since Nebulb detects and corrects the displacement of the stars before performing the stacking.
- Star trails: In this case Nebulb performs a specific stacking to record the trails left by the stars as they move across the sky due to the Earth's rotation.
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Special effects for star trails
Traditionally, star trails are obtained by maximum stacking, i.e., the final image is the result of calculating (pixel by pixel) the maximum of all the captured images. However, although this is the most common way in which star trails have always ...Stacking presets
All the tasks you want Nebulb to perform during stacking can be easily configured in the "Stack" module. Thus, before executing the stacking it is necessary to mark all those actions that you want Nebulb to perform during the stacking (depending on ...Remove flying objects in star trails
In Nebulb it is very easy to get a star trail image with no planes, satellites or meteors, simply by selecting the "Remove flying objects" option before stacking: Thus, during the stacking of star trails Nebulb automatically performs the removal of ...Sky/ground blending in star trails images
The sky/ground blending in star trails images is done in the same way as in aligned star images, except that in star trails you have to be especially aware of which image is used for the ground part. Thus, if you drop down the image selection list ...Exclude images with stray lights during star trails stacking
One of the main problems that star trails images have always had is that, as they are obtained by maximum stacking, any light that appears during the whole capture time is added to the final image (whether it is in the sky or on the ground). To solve ...