I'm not sure if is the correct location for ask this question. If not please info me the correct StackExchange site. As this wikipedia page show, there is one YUV format of image as YUV420 and YUV411.

I know what is YUV, but what those 420 and 411 means?

  • $\begingroup$ 420 means what it always does :) $\endgroup$
    – thang
    Oct 22 '18 at 16:40

The 3-digit number describes the subsampling of the chroma (U and V) channels. A detailed explanation is at


In particular, YUV420 means that the U and V channels have half the resolution of the luma (Y) channel, in the horizontal and vertical directions. The sampling method usually present in low to medium quality JPEG images is YCrCb420 (high quality JPEGs are usually YCrCb444 (no subsampling).

  • $\begingroup$ YUV420 doesn't mean (U, V) channels have half-the-resolution. 'U' has half-resolution, 'V' 1/4 of resolution. $\endgroup$
    – tripulse
    Dec 16 '19 at 14:52
  • $\begingroup$ @Quadcubic the accepted answer is in fact correct - half resolution in both directions for U and V $\endgroup$
    – Jacko
    Mar 24 '20 at 12:08

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