YUView is a YUV image player and analysis tool. However, it can do so much more: * simple navigation/zooming in the video * support for a wide variety of YUV formats using various subsamplings and bit depts * support for raw RGB files, image files and image sequences * direct decoding of raw h.265/HEVC bitstreams with visualization of internals like prediction modes and motion vectors and many more * interface with visualization for the reference software decoders HM and JEM * support for opening almost any file using FFmpeg * image comparison using side-by-side and comparison view * calculation and display of differences (in YUV or RGB colorspace) * save and load playlists * overlay the video with statistics data

Note: YUV is kind of RAW image format stored by color spaces. Y stands for luminance component, so it's in black-and-white, while UV are chromatic parts of the image.