How many pixel columns are needed to form one line pair?

• A. One column
• B. Two columns
• C. Three columns
• D. Four columns

Answer: (B)

A line pair is made up of a line and the space next to it. In a pixel grid, that means you need two adjacent columns: one column for the line (dark) and one column for the space (light). With only one column, you’d have just a line or just a space, not both, so you couldn’t form a complete line pair. Repeating the dark/light pattern across columns creates more line pairs, but the smallest unit that constitutes one line pair is two columns.