OPERATION
3-22
DLV 1280 User's Manual
are sampled. Proper pixel tracking may need adjustment when your image is
stretched or compressed and exhibits soft vertical bars of noise. For best results,
adjust pixel tracking from within a smooth gray test pattern made up of a clear
pattern of tiny black and white dots, or a similar graphic image. Adjust until the
noise either disappears or fills the image completely. When noise fills the image,
adjust pixel phase to eliminate it.
Or, if you know the resolution of your source, you may prefer to use a different
approach to adjusting pixel tracking:
1. Set the active pixels to match the resolution of the current source.
2. Set the correct size (set a 1280 x 1024 display to “1000”, for example).
3. Adjust pixel tracking in combination with horizontal position to exactly
fill the screen.
NOTE: By default, the projector samples at the correct frequency for a given
source. For best results, it is recommended that this default not be overridden.
Pix Phase
PIXEL PHASE
adjusts the phase of the pixel sampling clock relative to the
incoming signal (usually from an RGB input). Pixel phase may need adjustment
when your image shows shimmer. If shimmer is in vertical bands, adjust tracking
first. For best results, adjust pixel phase from within a smooth gray test pattern
made up of a clear pattern of tiny black and white dots, or a similar graphic
image. Adjust until the image is stable and each dot is clearly defined.
NOTES: 1) Always adjust pixel tracking before pixel phase.
Left Blank
LEFT BLANKING
blanks out the left edge of an image (turns it to black). You can
use this option in combination with horizontal position to center an image or
portion of an image horizontally.
Active Pix
ACTIVE PIXELS
defines how many pixels are used across the image. In most
cases, this number represents the horizontal resolution of the current source. For
example, if the incoming image is 1280 x 1024, there are 1280 active pixels
across the image. When reduced, the right portion of the image will be blanked.
Interpolate
When an image is resized extra pixels are added to the picture (vertically and
horizontally). If Interpolate is “
Off
” (default), the extra pixels are duplicates of
neighboring pixels, which maintains sharpness while possibly making some lines
wider than others. If Interpolate is “
On
”, the extra pixels are an average of the
adjacent pixels, which makes the image more even but softer. Choose the setting
you feel is most appropriate for the type of image present.
