What format should i save when i finish the cf?

what format should i save to get the face layer look like this? and what face sweat should i use to get this face layer?
i don't know what cf patcher did this cf
click the picture to make it larger

First of all - you need dds plug in for Adobe Photoshop. Download it. Next - open your fsh file for example edhause.fsh, export the texture like a dds(!) file. Then open your dds file(which you exported some seconds ago) with Adobe Photoshop. When you opened your dds file you will see 5 layers, one is called the alpha layer. If you want to use sweat, download Pdub's sweat pack. Open for example medium1.bmp file and copy the layer, paste over your alpha layer in your dds file. Then save your image like a dds file. Import in fshx. You can make some experiments yourself, but remember - always save, export, import your image like dds file. That's the major point.

In that image it looks like the author just desaturated a copy of the face layer and copied it into the alpha channel.