Primera LX610 Color Label Printer with Plotter & Cutter - Manual (Page 71)

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12. Note the difference in the preview when you increase and decrease the contrast.
Contrast to High: If contrast is too high you will lose the shape detection
and end up with a rectangle cut.
Contrast to Low: If contrast is too low you will end up with extra cut lines
outside of the main cut and potentially the wrong shape. In this example
the cut line is tracing the wrong part of the image.