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One more piece of data. I took the picture in the last post of the
+I > -I and +Q > -Q transitions, smoothed out the dots, and
converted from RGB to Lab. Lab is similar but not identical to YIQ.
I rotated the UV axes to actually be as close as possible to IQ.
I then made grayscale plots of "LIQ" for (top three) the I transition,
and three for the Q one. These are in fact highly contrast enhanced.
These do show some cross-interference between I and Q and
also show the fact that I has wider bandwidth, though the latter is better seen in the thumbnail of the color pictures.
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