How to set the background image of different versions of Win8

In the Windows 8 Developer Preview, the metro menu background image is stored in the shsxs.dll file in PNG format. The official does not tell us how to customize the background. In the Windows 8 Pre-beta version, the shsxs.dll file no longer exists. The metro menu background image is stored in the imageres.dll file in PNG format. We can change the background through the control panel, but we can only use it. The official has a built-in background.
Under the developer preview, in the Win8 Pre-beta version, we can no longer customize an image of the rgb tri-color combination to become the background through the editor. We need an 8-bit index color. picture of. If we don't use this format, the new background will not be the original color of the image.

The effect shown above is very ugly. If we want a good effect, we must use the original background palette to create an 8-bit index color image using tools such as Photoshop.