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206 VIDEO CAPTURE
values. Parade uses a different method from the others and is applicable for
video capture boards which have support for the parade method. The preview
window is a small representation of the current frame in the video window. The
red slider tab indicates the horizontal scan line from which the colors evaluated
in the test pattern are taken.
See next page for a chart outlining typical color values of a well calibrated
display.
2. Move the red slider next to the preview window so that it intersects each
distinct color in the test pattern. (If you have a vertical pattern then there is no
need to change it.)
3. Click the Get Image button. The vectorscope and waveform monitor redraw
indicating the various color values at the point indicated by the scan line.
In a well calibrated display, the green lines on the vectorscope should touch the
white squares and the graph in the waveform monitor should display a staircase
pattern (see page 80 for a typical example). If they do not, then you need to
adjust the settings using the software supplied with your video capture board.
4. Leaving the Color Calibration dialog box open, click Setup: Video Display to
open the Display dialog box. This dialog box allows you to adjust various color
values such as hue, saturation, brightness, and contrast.
It is important to keep both dialog boxes open so that any changes in the Setup
dialog box can be reflected in the Color Calibration dialog box. To view these
changes, you need to make sure that the preview test pattern in the Color
Calibration dialog box redraws itself regularly. To do this, set the Get video
frame for every option in the Color Calibration dialog box to 1 second. This
ensures that at every second the preview test pattern refreshes itself, thereby
reflecting any adjustments you make. (If the test pattern only appears for a
short time, click the Get Image button after each adjustment to refresh the
preview window.)
5. Adjust the various color values in the Video Display dialog box and look at the
Color Calibration dialog box to see how your changes affect the preview test
pattern. Once the vectorscope and waveform monitor show a properly
calibrated display, close both dialog boxes and prepare for capturing.
When adjusting color values, keep in mind the following:
• Changing hue rotates the green lines on the vectorscope clockwise or
counterclockwise (depending on the degree of change)
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