A free viewer is available from OKYZ(Raider3D ). Native video format used by RED high-resolution video cameras; compressed using REDCODE, an advanced wavelet technology codec that creates visually lossless images. RED cameras shoot in a resolution called "4K," which is much greater than 2K resolution supported by HD video. Therefore, R3D files may have much higher resolution than HD files. Because of this high resolution, RED cameras are commonly used for shooting modern cinematic films.