Contrast.

The options available with the Magnetic Lasso include:

• Detection Width. An area, measured in pixels, which the tool will use to search for high contrast areas in the path of the selection border to "hug" to.

• Edge Contrast. The amount of contrast required in the area (from 0 to 100 percent) to qualify as an "edge."

• Frequency. The spacing between magnetized points. The higher the number (from 0 to 100) the more frequently Photoshop will add points.

• Pen Pressure. Allows you to draw thicker lines when you press harder with a stylus on a pressure-sensitive tablet.

Use large width and higher-edge contrast settings with a higher frequency to create a selection that has well-defined images. Use a smaller width, reduced contrast settings, and a lower frequency to trace a softer-edged selection.

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