A generic blurry layer with transparency, maybe?

Question

User interface

The task is simple at first glance:
to create a translucent layer like this background,

which will be universal for any image below it.
That is, no matter what image you put under this layer, it would become blurry.
At the output, you need a ready-made translucent PNG file.
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Sounds strange, I know, someone tried to do this, share your experience?

Answer 1

I think that the blur is done by post-processing (in simple terms - Shaders). Just a translucent picture will not work.
Accordingly, in the case of Photoshop - just the picture is not enough, the layer under it will have to be subjected to some kind of distortion (blur).

Answer 2

At the output, you need a ready-made translucent PNG file.

It's impossible.
Somehow, a smart object in Photoshop will help automate the work - a blur filter is hung on a smart object, and we stuff pictures inside the object. But we still export the final blurry image.

Answer 3

Impossible.