Apple Final Cut Pro 5 - Manual (Page 334)

Chapter 23 Using Color Bars for Video Calibration 333
IV
7 Now, turn the contrast all the way up so that this bar becomes bright, and then turn it
back down.
The point where this bar is barely visible is the correct contrast setting for your monitor.
(The example shown below is exaggerated to demonstrate.)
When adjusting the contrast, also watch the white square in the lower left. If the
contrast is too high, the white square appears to “spill” into the surrounding squares.
Adjust the contrast until the luma of the white square no longer “spills” into
surrounding squares.
8 Once you are finished adjusting luma settings, turn up the chroma control to the
middle (detent) position.
Note: Some knobs stop subtly at a default position. This is known as the detent
position of the knob.
9 Press the “blue only” button on the front of your monitor.
Note: This button is usually only available on professional monitors.
When monitor brightness and
contrast is properly adjusted,
this strip should barely be
visible above black.