GIMP: Creating "Specular" Maps v3.80 for FSX (FSX: SE) & P3D.
A PDF file containing instructions for GIMP v2.10.xx (64-bit) Only.
How to... Creating Specular Maps using material masks with the addition of keyboard shortcuts
GIMP (v2.10.10 & Later):
⦁ GIMP-DDS Plugin (64-bit “.zip” File). Make sure you the latest release. The internal version of the DDS Plugin is incomplete!
⦁ Found: https://code.google.com/archive/p/gimp-dds/downloads ⦁ Install: Drive:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins
⦁ An internal version of the High Pass Filter is already installed in the software