Pixel and frame aspect ratios
A.
4:3 square‑pixel image displayed on 4:3 square‑pixel
(computer) monitor
B.
4:3 square‑pixel
image interpreted correctly for display on 4:3 non‑square pixel
(TV) monitor
C.
4:3 square‑pixel image
interpreted incorrectly for display on 4:3 non‑square pixel (TV)
monitor