GRASS VALLEY LDX 150, Руководство пользователя

Страница: 96 / 185

78
Video setup
LED Wall Filter
+ ✎
Tip
V-Shift can also be used to remove color shifts that may occur when shooting DLP-type
projectors.
LED Wall Filter
When shooting against LED Wall backgrounds that contain high frequencies, interference
may occur, resulting in unwanted moire patterns. A special electronic filter is available that
can be used to reduce these effects:
In the camera menu, navigate to the
Production Setup > Exposure item and switch
Led Wall Filter
on.
Color
Color Temperature
For true color reproduction the ambient lighting conditions must be compensated for by
selecting a value for the color temperature. The standard file setting is 3200 K (normally
used for tungsten and indoor lighting). Two other reference color temperatures are
available: 5600 K (for outdoors, clouded conditions) and 7500 K (for outdoors, clear blue
skies).
The memory positions (FL50, FL60, AW1 and AW2) are available to store the results of the
auto-white measurement process. The memory positions store measured values using the
automatic white balance switch at the front. The FL positions are recommended for
shooting with fluorescent light.
A continuous automatic white balance position (AWC) is also available. This function
continuously measures the white balance and adjusts it accordingly. It can be used when a
constant color balance is required under changing lighting temperatures (sunsets,
indoors/outdoors use).
Color Tint
In some cases, color temperature alone is not enough to fully compensate for color cast so
an additional tint adjustment is needed. Similar to how color temperature specifies the
relative warmth or coolness of an image, tint generally specifies the balance between
magenta and green color casts. When combined, color temperature and tint can therefore
control and effectively remove virtually any color cast.
Color Filter
In the auto-white positions (FL50, FL60, AW1 and AW2) a color filter can be set up in the
production Setup > Color > Color Temp > Color Filter
menu. This varies the color
balance to obtain warmer or colder color effects.
CAM