>If you have a progressive frame in 4:2:0, then
>the first chroma line is the average from lines 1
>and 2. The second chroma line is the average of
>3 and 4.
>
>If you have an interlaced frame, the first chroma
>line is the average of the first two lines of the
>first field. With the fields interleaved, they
>are lines 1 and 3. The second chroma line is
>from the first two lines of the second field,
>which are lines 2 and 4. Assuming top field
>first.
OK, I'm pretty sure I understand this. But
wouldn't I have to have 4:4:4 data (i.e. 720x480
chroma data to go along with my 720x480 intensity
data) in order to fix the chroma properly? Can I
even get that? Also, when dealing with an NTSC
signal of something that was originally 24 fps,
i.e. the "not really interlaced" case, wouldn't
the color be subsampled according to progressive
frame rules?
Steven Boswell
ulatekh at yahoo dot com
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