Vidikron Vision 140 Technicians use the White Balance submenu, Internal grayscale test pattern

Installation

White Balance

1.	Pre Calibration
2.	Red Black Level	256
3.	Red White Level	256
4.	Green Black Level	256
5.	Green White Level	256
6.	Blue Black Level	256
7.	Blue White Level	256
8.	Auto Color Enable
9.	Clamping
			Back Porch

0.Clipping Detector

Color Enable Red

Filter: The proper filter setting is automatically set for virtually all signals, and rarely needs to be changed. It applies a low pass filter for noise reduction in the incoming input signal, particularly for HDTV or SDTV. Applied in the analog domain before sampling, this filtering removes high frequencies and thus reduces pixel phase noise (note this also reduces signal bandwidth). Override only if standard pixel tracking and phase adjustments do not adequately clear up a “noisy” video signal, or if a graphics signal appears overly “soft.” Both instances indicate that “Filter” may be set to the wrong option.

Sharpness: “Sharpness” changes the amount of high-frequency detail in a video image so that edges remain clearly defined. It can be particularly useful if a significant “Noise Reduction” adjustment has caused the image to appear too soft. Adjust until the display is as sharp as desired, keeping in mind that because “Sharpness” adds some high frequencies back into the image, it can also reintroduce a certain degree of noise.

Noise Reduction: Noise Reduction is similar to the “Filter” control, but operates in the post-sampling digital domain with a more subtle effect. Higher settings are most useful for clearing up noisy RGB images such as those from a PC. Adjust as desired, keeping in mind that reducing noise (which reduces high frequencies) may also soften the image.

Color Space: “Color Space” determines how the color components of an analog input signal are decoded for accurate color in the display. With the Vision 140/150, this should always be set to RGB.

Decoder Adjust: This sub-menu is not applicable to the Vision 140/150.

White Balance: Good RGB or white balance — that is, the white and black levels for each of the three primary colors, red, green and blue — ensure that images from analog sources other than decoded video have maximum contrast without crushing black or white.

By default (and in an “Auto Setup”), the projector automatically determines the best input levels by monitoring image content and adjusting the controls appropriately; further adjustment is typically not required to obtain proper blacks or whites.

However, for a very unusual source exhibiting one or more overly high black levels (typically caused by a noisy source causing black level spikes), an experienced technician may prefer to use the White Balance menu. These adjustments, which together serve as a calibration process compensating for differences in sources and cabling, enable an experienced technician to perfect the source image input levels and eliminate the “overshoot” and “undershoot.”

1. The White Balance controls are of limited use with digital signals, but

Note	do offer some ability to tweak poorly mastered source materials.
	2. Because the projector automatically optimizes input levels for all but
	the most unusual of sources, it is recommended that only experienced
	technicians use the White Balance submenu.
	3. Before beginning, check that overall White Level and Black Level
	settings are near 50 and that color temperature is properly set using an
	internal grayscale test pattern.

54 Vision Model 140/150 Installation/Operation Manual