If we call scanning lines 1, 2, 3, 4, etc., then, interlace luma, 1 is followed by 3 and 2 is followed by 4. If there is half-vertical chroma resolution, then we can think of it as having chroma on 1 and 2 but not on 3 & 4. In the reconstructed image, therefore, we can envision a two-line gap in chroma info. This is problematic, in particular, for color-replacement keying.
TTFN, Mark Manfredi, Albert E wrote:
Craig Birkmaier wrote:Note that there is no need for a 4:2:2 color space for progressive images.Can you explain this? I thought that 4:2:2 uses half the luminance bandwidth for Cb and Cr, horizontally. And that 4:2:0 uses half the luminance bandwidth for either Cb or Cr, where Cb and Cr are either alternating line by line or centered between alternating lines. I thought that 4:2:0 was especially well suited for interlaced images, and 4:2:2 would be ideal for progressively scanned images. Bert----------------------------------------------------------------------You can UNSUBSCRIBE from the OpenDTV list in two ways:- Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.
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