could someone give me a hint how I could draw a border around a transparent image of a tree without too much effort? I tried creating a duplicate layer and resizing it before merging both layers but due to the image's complex edges, this didn't provide the desired result.
Thanks in advance.
One quick way to create a border around a cut object (a tree in your case) is to right click on the layer > select Blending Options > Stroke.
[You can also access Blending Options from the Layer tab > Layer Style > Blending options]
The Stroke menu will look something like this:
You can adjust the size, position, blend mode, opacity and color of the stroke along with changing the Fill Type from color to pattern or gradient.