Difference between revisions of "YCbCr 4:2:2"
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Revision as of 20:22, 1 June 2007
- FourCCs: YUY2, UYVY
(These FourCC names only reflect that the YCbCr of digital media is often falsely mixed up with analog PAL's YUV color space.)
YCbCr 4:2:2 is a packed YCbCr format in which a pair of consecutive pixels is represented by 1 Y sample each but share a Cb sample and a Cr sample.
This type of data may be packaged in a container format with a a FourCC of YUY2 which indicates the following byte formatting:
Y0 Cb Y1 Cr
The first pixel is a a function of (Y0, Cb, Cr) and the second pixel is a function of (Y1, Cb, Cr). Alternately, the FourCC UYVY is used to indicate YCbCr 4:2:2 data with a byteswapped order:
Cb Y0 Cr Y1
For trivia, the 2 in YUY2 most likely refers to the number of bytes needed to represent a single pixel. Since 4 bytes represent 2 pixels, an average of 2 bytes are required to represent a single pixel in this scheme.