Mask generator for Resident Evil HD mod. Actually, there are two of them. One for the original backgrounds, the other (in the "bio1dc" folder) for Director's Cut backgrounds. Usage: Upscale (1280x960) the entire contents of the "dump\bgd\". Put the result in "hires\bgd\". Run the tool. The result will be in "hires\mask\". v20220731 changes: added all other lo-res source files.