Hi guys, I'm new here!
My name is Ste, I'm italian and I apoligize for my not good english (I'm studying english).

I'm an indie game developer that use Unity.
I want to talk you about a problem in Unity when I import sprite images and maybe a way in Photoshop to easily solve this.

When I import a grid sprites in Unity I can slice it in multiple images accordly to a grid:

The problem is that Unity requires at least 1 transparent pixel between one image and the other to properly import sprites sliced by grid.

There is a script, a plugin or a way in Photoshop to add this 1 pixel transparent between a grid images every X pixel, to export an image file good for Unity?
Thank you very much for the help!