![]() This method is called chroma subsampling.Ĭhroma depend on luma in math calculations, so if you loss some color info - you slightly alternate luminance in some part of the result image. Higher compression of the chroma possible through U and V downscale (by horizontal or vertical). Human eye is less sensible to color than to brightness of the visual signal, thus chroma info (UV) require less detail and may be compressed higher (with loss). Special math and quantization of this channels bring to us YUV (Y - luma, like "luminance/light" U and V - chroma, like "chrominance/color"). ![]() This allow to compress color info separately from the luminance. For higher compression rate, video encoders usually use methods of representation of each video frame as 3 separate channels: one for luminosity and two for color.
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