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When an object is being controlled in aspect ratio mode, the horizontal size will be adjusted first, then the
aspect ratio applied to determine the correct vertical size. The pixel aspect ratio and the object aspect
ratio are both used to calculate the vertical size of an object of a given horizontal size. The following
formula is used to calculate the vertical size:
Number of V lines = Number of H pixels x (Pixel aspect ratio / Object aspect ratio)
This calculation will be rounded to the closest line or to the closest line pair if object centring is on.
Example: Draw a box in 525/4:3 mode with an aspect ratio of 4:3, with a width of 708 pixels.
V lines = H pixels x (Pixel AR / Object AR
= 708 x ((160/177) / (4/3))
= 480
The selected object aspect ratio defines the ideal dimensions of the object. The on screen and front pane
aspect ratio displays show the actual object aspect ratio rounded to 2 decimal places. It may vary slightly
from the selected object aspect ratio due to the effects of rounding to the closest line, and object centring.
The setting of the Mask Apert item in the Setup menu control the maximum horizontal or vertical size of
the mask when one of the specific aspect ratios is selected. The user is still able to adjust the size of the
mask all the way out to the production aperture regardless of the Mask Apert setting.
4.3.2. Controlling the Object Size
The SIZE button is used to control the size of the selected object (the one with its button blinking). The
horizontal and vertical size of the object can be controlled independently using the left and right shaft
encoder knobs respectively, if auto aspect ratio mode is Off. If one of the auto aspect ratios is selected,
then either of the shaft encoder knobs will adjust the size of the abject about the centre of the raster while
constraining its dimensions to the selected aspect ratio. See the specific section for each object for
specifics about controlling the size of specific objects in each mode. The size adjust function will be
deselected after 3 minutes of panel activity, or when the another button is pressed.
4.3.3. Controlling the Object Position
Press the POS button to control the position of the selected object (the one with its button blinking) when
auto aspect ratio mode is Off and the Setup menu Force Centre item is set to no. The horizontal and
vertical position of the object can be controlled independently using the left and right shaft encoder knobs
respectively. If one of the auto aspect ratios is selected or the Setup menu Force Centre item is set to
yes, then the position of the mask, box, and circle objects is fixed to the centre of the clean aperture. The
position of the cursor is not affected by the Setup menu Force Centre item or auto aspect ratio mode. See
the specific section for each object for specifics about controlling the size of specific objects in each mode.
The position adjust function will be deselected after 3 minutes of panel activity, or when the another button
is pressed.
DESKTOP REMOTE OPERATION
Models 9590 & HD9590 Graticule Generator Manual
Page 4-11
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