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.
MEF is Mamiya's own RAW format. A high-quality Japanese brand is well known to those who take professional photographs. His story began in the 1940s. It was then that camera designer Seiichi Mamiya and investor Tsunejiro Sugawara created Mamiya. Mamiya ZD cameras are the first mid-format digital cameras. The expanded name of the MEF format is Mamiya RAW Image. He gained fame as a format of "digital negatives". Mamiya has developed this format in order to use it in cameras of its own production. At the same time, the main goal was to store the photos in an uncompressed form, so that later they would be processed without losing quality. The format is built on the principle of a RAW file. It contains a complete set of information that is received from the camera lens. RAW images are uncompressed files. They can be customized using image editing software. They are often preferred by professional photographers, because they are tasked with having high-quality images with many details. An MEF file is capable of storing an image as if it had been made into a CCD camera device. In most cases, it is stored on a memory card, and then transferred to a computer in order to edit and publish.