The Targa® (TGA) format is designed for systems using the Truevision® video board and is commonly supported by MS‑DOS color applications. Targa format supports 16‑bit RGB images (5 bits x 3 color channels, plus one unused bit), 24‑bit RGB images (8 bits x 3 color channels), and 32‑bit RGB images (8 bits x 3 color channels plus a single 8‑bit alpha channel). Targa format also supports indexed-color and grayscale images without alpha channels. When saving an RGB image in this format, you can choose a pixel depth and select RLE encoding to compress the image.