*The THX Optimizer test signals displayed are for reference use only. Be sure to check your equipment’s operations manual or refer to your service technician before making any internal adjustments on your monitor.
A Multi-burst signal has been added to the Monitor Performance test pattern for the purpose of assisting you in adjusting your television/monitor’s Sharpness control. This procedure is designed to let you optimize the way the overall television/monitor’s picture resolution looks.
Note: While this setting is often determined by personal preference, an optimal adjustment will ensure you presentation as intended by the film’s director.
Adjust your Sharpness control until the lines (see Figure 10) in the multi-burst signal become “edgy”, then reduce the setting until the lines are well defined, but not overly enhanced. Over adjusting can cause the picture to appear too “crisp”, while under adjusting can make the picture appear to be “soft” or slightly out of focus.
The Sharpness control setting is subjective to the viewer. Applying too much sharpness will make the picture appear noisy while the proper setting will produce a sharp picture without the noise.
If you do not have THX blue filter glasses, the Color Bars portion of the Monitor Performance pattern can also be used to adjust your television/monitor’s color and tint. Adjust your Color control so that the red box is red, but not bleeding. Next, adjust your Tint/Hue control until the Cyan (see Figure 10) and Magenta (see Figure 10) boxes are truly cyan and magenta in color.
Your television or video monitor’s overall performance can be assessed using this useful signal. The white crosshatch pattern lets you determine the existence of convergence errors.
Convergence errors are seen as color edges on the white bars (see Figure 11). Perfect convergence is desirable but seldom achievable in consumer monitors. For a closer examination of convergence errors, use the white dots. The objective is to minimize the number of convergence errors. A 10-step grayscale is included that can expose any misalignment in the monitor’s color balance adjustments (see Figure 12). Misalignments can show up as a slight color tinting of the black and white content in the 10-step grayscale.
Color balance errors can occur in the process of displaying a picture on the screen, when the video signal is converted into separate red, green and blue “components” to drive each of the picture tube’s three electron guns. Incorrect settings between the separate red, green or blue circuits can cause one channel to respond differently than the others.
Convergence errors and other color balance problems affect not only black and white content, but color images as well. As this involves a fairly intensive understanding of your monitor’s alignment section, you should call an experienced service technician to perform any of these adjustments on your monitor. The picture tube relies on magnetic energy to move the dots of color, and any movement or re-direction of your monitor can cause changes in alignment due to stray magnetic fields or charges that can remain on the picture tube’s inner components. Just transporting the monitor from the service technician’s place of business to your home can disrupt these sensitive settings, so adjustments should be performed in your home with the monitor placed in its viewing location. The monitor should also be facing the general direction that it will face when used as even the magnetic flux of the earth can effect this setting.