[dtvmcdonald]

The following are for visual use. The first is a modified version of a standard pattern used with a blue
filter to set "color" and "hue". The modifications allow
using red and green as well. It also has I and Q bars. The color bars are not
up to full luminance. They are 100% saturation. The long white bar is 100% luminance.

The second one has the same purpose as the first, except at variable luminance,
the brightest being full luminance RGB.

The next three are convergence and linearity patterns

The last is a special test for I-Q sets to determine if the Y and I delay lines are proper to match
the timing of Q.