Lumagen VisionDVI & VisionHDP - Manual (Page 24)

VisionHDP ™
User Manual and Installer Guide
© 2004-2007 Lumagen®, Inc. 21 Rev 1.14
The goal is to stretch the image to fill the screen in a way that looks as natural as possible. The
Lumagen NLS command is very flexible and allows the image to be adjusted to user preferences
to achieve this goal. The NLS adjustments are center width, center stretch, top cropping and
bottom cropping. The center section of the image is stretched by a constant amount from 0 to
24% (CENTER STR%). The width of the center section can be set from 15% to 75% (CENTER
SIZ%). By programming the center section width and stretch amount, the amount of non-linear
stretch in the left and right sections can be optimized. In addition, the top (CROP TOP%) and
bottom (CROP BTM%) cropping can be set from 0 to 12%. Increasing the amount of cropping
reduces the amount of stretch near the left and right edges of the image. When setting the
cropping parameters, it is recommended that the satellite/cable box menu be checked to assure
that critical parameters remain visible.
The NLS feature is off by default, and must be enabled before any of its parameters can be
changed. Also, it is only active when the input aspect ratio is set to 4:3. The command reports
the NLS status as "OFF," "NLS1", "NLS2" or "USER" mode. It is recommended that NLS2 be used
as a starting point before setting user preferences. After selecting NLS2 or NLS1, changes to any
parameter automatically selects USER mode.
Some 4:3 sources fill the entire source image (e.g. DVD 16:9 movies), but other sources place a
4:3 image in the center of a 16:9 image (e.g. HDTV with up-scaled SD source). This latter case is
seen as a “pillar-boxed” image with black bars on the left and right. The “PILLARBOXED”
parameter must be enabled for this case. The Lumagen will then crop the pillbox bars and stretch
the active 4:3 image.
When enabled, the NLS command is only active when the 4:3 input source aspect ratio is
selected. Since it is often desirable to view a 4:3 source as transmitted, without stretching it; the
NLS command allows either the 1.85 (or LBOX), input aspect ratio button to be reprogrammed to
turn off NLS (using the “NLS OFF BTN” parameter). This is global to all configuration memories
which have NLS enabled. Note, the 1.85 (or LBOX), source aspect button still selects the
respective input aspect ratio for configuration memories that have NLS disabled. When this
feature is enabled, a 1.85 (or LBOX), source aspect ratio can still be selected using the left and
right arrows buttons to step through the aspect ratios while the menu is not visible on the
screen.
When NLS is enabled, the image will fill the screen with the 4:3 (1.33) source for any output
aspect ratio up to 1.85. If the output aspect ratio is greater than 1.85, software limits the
maximum width to the equivalent of 1.78 and adds left and right sidebars.
Select the parameter to adjust using the ‡ and ˆ arrows, and change the value of the selected
parameter using the … and † arrows. The command format is:
MENU → IN → CONFIG → ADJ → SIZE → NLS → […, †, ˆ, ‡] OK
Pass-Through mode
The source image is scaled by default, even if the input and output resolution match (i.e. 1080i in
and 1080i out). The SCALE command allows scaling to be disabled if the input and output
resolutions match. Note that since the general case is to have a single output resolution that
matches the native resolution of the display, any source input resolution that does not match the
output resolution is still scaled.
MENU → IN → CONFIG → ADJ → SIZE → SCALE → (NORM, PASS) OK