Unit: mm/mm/cm/inch;
X Direction: the length in the X direction of the ruler;
Y Direction: the length in the Y direction of the ruler;
Demarcation Adjustment: Move the movable points (in the blue circle) of demarcating ruler on the Image, the value of trim
size (unit length per pixel) will change;
Y=X: Make X-Ruler is equal to Y-Ruler;
Save: Save the currently demarcated parameter;
Load: Load the demarcated-parameter file.
: Set the colors of measuring lines, movable points and texts.
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