GRASS VALLEY GV KORONA, User Manual, Page: 321 / 415

Kayenne/Karrera/GV Korona
User Manual
325
Corner Adjust Limits
Corner Pinning works for convex quadrilaterals but not for concave quadrilaterals. A convex
quadrilateral is defined as a four-sided shape with all angles less than 180 degrees, all
vertices point outwards and all diagonals lie entirely inside the quadrilateral.
Results from adjusting a corner beyond the limits are undefined.
Convex Quadrilateral—Corner Adjust Limits
To allow fine adjustment of an image when using Corner Pinning, the View Through (View
Thru Enable) feature allows you to temporarily (for editing purposes only) reduce the
opacity of an iDPM channel to let you “look through” the image to align the corners
precisely with the background.
Corner Pinning and Cropping
Corner Pinning is designed to work in conjunction with cropping. Each time Corner Pinning
is turned on, the pinned corners will be adjusted to match the current iDPM crop settings.
After pinning the corners of an image you can crop it to select the exact portion of the
source video to display in the corner pinned area.
For example, your source video could contain two people, but you may want to fly the
image of only one person. In this case, you could build an effect, turn on Corner Pinning,
use crop mode, and leave the corners at the defaults. If you now move the crops
maintaining the original aspect ratio (4x3 or 16x9) you can position these crops so that only
the desired person is shown. If the person or the camera moves, you can adjust the user
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