Grass Valley Karrera Video Production Center Installation v.4.1 - Manual (Page 188)

188 KARRERA — Installation & Service Manual
Section 5 — Basic Configuration
Default iDPM Crop
Default crops are intended to define the extent of a standard image for a
facility. The Default iDPM Crop controls adjust cropping when individual
iDPM channel crop is turned off. Individual iDPM cropping is used to
adjust for variations in individual sources.
SMPTE RP-187 establishes recommended practices for standard image
sizes (production aperture, clean aperture). If a facility conforms to these
practices, the Karrera system default values will be correct and no adjust-
ment should be necessary. Changing the default crops is not recommended,
unless absolutely necessary.
Unfortunately, not all video images have the transition to blanking (black)
in exactly the same place. Normally, these blanking variations are hidden
at the extreme edges of the picture and are not visible. If an image smaller
than expected is transformed, however, black lines can occur at its edges,
which are now visible because they have moved inside the visible picture
area. If it is necessary to compensate for variations in your facility's nominal
blanking, adjust the default crops so they just remove black edges on the
facility’s normal image.
The 4:3 and 16:9 aspect ratios have different default crops.
Crop Edge – Allows setting alternative cropping for iDPM processing.
Unity – Resets iDPM cropping to factory default.
Timing Analyzer
The Video Settings Menu also has a timing analyzer and system timing
adjustments. See Timing Analyzer
on page 70 for more information.
Node Settings Menus
The Node Settings Menus are used to establish communications among
various Karrera system components. These important settings are not
included in Eng Setup configuration files, to prevent accidental system
communication failures if Eng Setup files are loaded incorrectly.