TGA is a long-used raster graphic format. It was developed by Truevision Inc. (now Pinnacle Systems) back in 1984. It was initially used by the developer only for its own graphic adapters, but gradually gained popularity (primarily in the field of video processing and animation). Widely used in computer games, where it is used to store textures (including 3D video games). The name of the format comes from Targa Graphic. TGA files may partially contain image transparency information. They can become the main one for creating GIFs.
ORF is a highly specialized raster image format. Created by Olympus camera manufacturer to store digital images taken by these devices. The name is an abbreviation for Olympus RAW File. ORF files are sometimes referred to as digital negatives. In this format, digital data from the camera sensor is stored in its original form, in excellent quality (the highest possible) and without distortion. Image storage is in its raw form. Editing an ORF file is only possible if it is converted to another format.