Uncompressed does by no mean RGB and full resolution. Uncompressed is a codec with raw data and without lossless compression (zip or similar), think a regular text file, a .bmp, or a .wav. An uncompressed video codec can be YUV 4:2:2. If you are using an uncompressed codec, you can recode it millions of times without ever losing any information for the source.
Like I wrote in a previous post, 4:2:0 is not a and half resolution blue channel, and a quarter resolution red channel. Both chroma channels - which neither are blue or red - have the same sampling : a quarter of resolution.
Lossless and lossy compression are terms that describe whether or not, in the compression of a file, all original data can be recovered when the file is uncompressed. Lossless compression reduces a file's size with no loss of quality. This seemingly magical method of reducing file sizes can be applied to both image and audio files. While JPEGs and MP3s use lossy compression, newer compression algorithms, such as JPEG 2000 and Apple Lossless compression, can be used to create lossless compressed files. The PNG format is supposed to be a lossless format, but when you save an image as a PNG file, you are asked to choose a compression level.
Exploring Nikon D5200 HDMI output - review update
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Lossless and lossy compression are terms that describe whether or not, in the compression of a file, all original data can be recovered when the file is uncompressed. Lossless compression reduces a file's size with no loss of quality. This seemingly magical method of reducing file sizes can be applied to both image and audio files. While JPEGs and MP3s use lossy compression, newer compression algorithms, such as JPEG 2000 and Apple Lossless compression, can be used to create lossless compressed files. The PNG format is supposed to be a lossless format, but when you save an image as a PNG file, you are asked to choose a compression level.