To create a centered frame line with a center cross as in the
example, a total of six lines is necessary.
To calculate the position of a line for a given aspect ratio, use the
following formulas:
− horizontal lines for aspect ratios >1.78 (e.g. 1.85): [1-
(1.78/Aspect)]/2=distance from bottom or top
− vertical lines for aspect ratios <1.78 (e.g. 1.33): [1-
(Aspect/1.78)]/2=distance from left or right
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