Re: [Gimp-user] Any way to set a layer to be semi transparent?

[Pat David <patdavid gmail com>]

On Mon, Apr 17, 2017 at 5:30 AM Seldom <forums gimpusers com> wrote:

> I'm an ex Photoshop user who does astrophotography (AP).  In AP we
> frequently
> shoot a number of photos that we then stack in layers to reduce noise or
> create
> color channels.  One problem with stacking is that the sky may move between
> photos. (It's called field rotation.)  This can be corrected if the stack
> is
> aligned properly.  While Photoshop has a number of automated stitching
> techniques available, I can't find any of these in GIMP.
GIMP doesn't currently have an automated way to align images, but that
doesn't mean that there aren't ways available in Free Software.

A commonly used option is a script that comes with the panorama stitching
tool, Hugin: align_image_stack

You can read a little about using it (it's pretty simple) here:
https://patdavid.net/2013/01/focus-stacking-macro-photos-enfuse.html#hugin-align-images