Blender addon to reconstruct normal maps in Blender, adds a small UI panel to Blender's image editor.
As games compress their normalmaps and so when extracted they lack the Z channel as it is computed on the fly. Normalmap Utils will recreate the normalmap, generating the Z channel from the X&Y data. The channel this data is in can vary depending on the format they were converted from (BC3,DXT5..) and so there are two common options provided in the drop-down as well as a custom selection mode for extra support.
Important: After converting you must save your result will revert once Blender's cache clears.