Transparent blurred outline

To insert one picture onto another, it must have a transparent background, or even better, a fuzzy outline, in order to get the following result:

It is easy to give a fuzzy outline to an image with a fuzzy edge or fuzzy border filter in English, but a few more steps are required for a transparent background.

Load an image with a blurred path. Check in Image -> Mode that it is in RGB mode.
Click an image in the Layers panel. Click Add Alpha Channel to add an alpha channel. If the option is gray, the picture already has a channel, do nothing, or even better delete and add again.
Click Filters -> Decor -> Blur. The thickness of the border 16 corresponds to the size of our image . Make sure Image Flattening is off. This is "Flatten image," if Gimp in the English version, which is my case.
This creates a layer over the female face with a white blurred edge .
Click this new layer at the top, and then click Alpha to Select from the pop-up menu. You will receive a modified image in the center window.
Delete Top Layer.
Click Edit -> Clear. Now you get an image of a female face with a blurred outline and a transparent background.
I recommend exporting this image to PNG format.

Inlay is a simple act. Simply upload both images, copy the blurred edge image using CTRL-C, and paste it onto the other image using CTRL-V.

In our example, we get a mention of Jessica Alba in the movie Blue Hell. The result, of course, is a perfect, blue background in the image of a female face, for example, would give a better result, but I think we will understand the principle .