640/480 (77.5K Picture)
800/600 (103.5K Picture)
This chart used to have a critical part to play in aligning vacuum tube color television cameras. Now, we use it for its circles, arrowheads, and fine, even grid lines. Display this chart in the appropriate size for your monitor and make sure the circles are round. Actually put a piece of paper right up to the screen and mark the side-to-side edges of the large circle in the middle. Take that same paper and turn it so the measurement goes top to bottom. Did the circle come out the same size? Can you see all eight of the fine black arrowheads along the edges of the picture?