In the case that in a star trails image there are trees (vegetation) protruding above the horizon it is very convenient to select the maximum image for the ground (to get the most natural result possible). Below you can see the difference between ...
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 ...
The most common way to process a star trails image is to select the maximum image for the ground part, since it is the easiest way to obtain a more natural result. However, the big disadvantage of using the maximum image for the ground is that it can ...