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How to convert RGB to ycbcr420?

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ramdori
ramdori on 22 May 2011
I'm trying to convert RGB to ycbcr420. but I don't know how to do that,
if one bmp image is converted to ycbcr,I try to this code,
ycbcrimage=rgb2ycbcr(RGBimage);
but this ycbcrimage is 4:4:4 mode, isn't it?
What can I do to get ycbcr420?
thanks!

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