Vidikron 140/150 Manual De Usuario

• Black Levels and White Levels: To check your image and adjust these controls: 

1. Make sure overall “White Level” (contrast) and “Black Level” (brightness) settings are 

both set to near 50. (Not required for “Pre-Calibration” adjustment.) 

2. Check the color temperature setup using an internal grayscale test pattern, making 

sure to obtain a neutral grayscale. (Not required for “Pre-Calibration” adjustment.) 

3. If the blacks and/or whites appear OK, input levels do not need adjustment. If black 

levels are too high (and/or whites are too low, which is rare), you likely have a noisy 
source that is producing skewed input levels. Continue with Step 4. 

4. Temporarily enable “Pre-Calibration” in the White Balance submenu. Wait for all six 

values to stabilize. Alternatively, do not use “Pre-Calibration” — reduce black levels 
manually instead. Judge by eye and change one or more of the six levels as necessary 
to obtain proper blacks and whites. You may want to see only a certain color while 
adjusting; if so, use the “Color Enable” option (described below). 

5. Clear the “Pre-Calibration” check box and exit the White Balance menu. 

• Auto Color Enable: When a check mark is present, selecting a specific black level or drive 

to adjust will automatically enable the corresponding color in the display. Delete the 
check mark to see all colors. 

• Clamping: This option can brighten the image produced from certain high-resolution, 

high-frequency graphic sources. For almost all sources, the best clamp location is 
automatically selected by the projector. 

•

Use  the  normal  Back Porch location if the image is either sufficiently bright or overly 
bright. 

•

Select Sync Tip if the image appears unusually dim, if there are horizontal streaks 
across the image, or if there is significant color drift. This moves the clamping pulse 
from the normal back porch location (which is likely too short) to the tip of the 
horizontal sync pulse. 

•

Tri Level is typically recommended for an HDTV source where the back porch is also 
short, or for video sources or any RGB source with sync information included on the 
video (for example, sync-on-green). 

• Clipping Detector: The Clipping Detector is a tool to assist with defining individual input 

levels, enabling you to accurately set the white balance for any particular source with the 
appropriate image. 

Enabling the Clipping Detector activates a special operating mode for detecting only 
pixels that are considered black or white; all other levels are displayed as a mid-level gray. 
When used with a smooth grayscale pattern in which black and white are known to be at 
opposite edges of the image, you can watch these isolated areas while adjusting 
individual black and white levels until both black and white edges are just visible and 
distinguished from neighboring pixels. Images from this source will then display correct