CALLIBRATION TEST PATTERNS
Brightness and contrast:
Using the pattern: The gray scale is shown as a series of squares in the center of the image that range from black (0%) to white (100%) in a semi-rectangle. The 0% and 100% squares (see arrows on image at left) each contain smaller squares within them that represent signal level steps of 5% and 95%, respectively. You should be able to visually differentiate the inner square from the larger square that contains it.
Be aware that it
may be impossible to adjust your monitor to show both of these inner
squares perfectly and equally. Most video monitors do better in showing
the 95% square than the 5% square. However, you might see if reducing
ambient light improves the visibility of the 5% square.
Using the pattern: In each corner of the image as well as in the very center (see arrows on image at left), inspect the 6 squares filled with varying widths of alternating black/white horizontal and vertical lines. You should be able to differentiate all the lines, from fat to narrow (6 pixels, 4 pixels, and 2 pixels) and both horizontally and vertically.
No concentric ring-like features should be present. If such features are present, the images displayed on your system will be displayed at less than optimal quality.