In a Parade scope, what does the 0 line represent?

• A. Absolute black
• B. Pure white
• C. Mid-gray
• D. Reference black

Answer: (A)

The main idea is that the Parade scope’s bottom of the scale shows the darkest signal possible. The 0 line marks zero luminance, which is absolute black. In digital video, this is the point where there’s no light information in the signal. So when you see traces touching 0, you’re looking at true black.

Pure white would be at the top of the scale, mid-gray sits near the middle, and reference black is a calibration term from some workflows, not the actual zero luminance shown on the Parade scope.