Full instructions can be found here!

Importer for GIMP Image Files allows you to seamlessly import XCF files produced by GIMP (the GNU Image Manipulation Program) into Unity as though they were regular image files, such as PNGs. This removes the need to have both a master XCF file, which may include layer information that would be lost on an export, and a separately exported file specifically for importing into your Unity projects. XCF files are treated as regular assets, so modifications to them will trigger an automatic re-import in Unity.

Features include:

• Asset Pipeline integration for XCF files using a scripted importer.

• XCF files can be imported with identical settings to regular image files. Sprites, sprite sheets, normal maps, cursors, etc. are all supported.

• Full support for all GIMP features up to XCF file version 11 (as exported by GIMP 2.10.x).

• Public methods to load XCF files manually from code, returning a Texture2D, are provided.

• Full asset source code included.

Asset uses DotNetZip library under Microsoft Public License (Ms-PL), Jzlib License and Zlib License; see Third-Party Notices.txt file in package for details.