[video] Alpha blending 4:2:2 sources

[Alexander_Holland@Zarlink.Com]

Hi,

does anyone have any details on Alpha Blending when your source data 
is Y'CbCr data in 4:2:2?

Standard alpha blend algorithms such as

Pn = a * Gn + (1 - a)Vn

(Where P is the final pixel, and Gn is your graphics pixel and Vn is the 
video pixel)

Work on pixels, when your source data is 4:2:2 you dont so much have 
individual pixels, but Colour components (or perhaps pairs of pixels).

Any advice appreciated.

Cheers

Alexander Holland
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