The sensing area width can be set in the Options bar and when you move the tool along the edges in a picture, the magnetic lasso is able to sense where that edge is and create a selection that follows the edge. The magnetic lasso tool can be used to create semi-automatic outline selections. Figure 2 below shows the polygon lasso tool options bar.įigure 2The polygon lasso tool Options bar.
Or you can hold down the Option/Alt key to subtract from an existing selection or hold down the Shift+Option/Shift+Alt keys to intersect with an existing selection. As with the marquee selection tools, you can hold down the Shift key and then drag with the lasso or polygon lasso tool to add to an existing selection. Release the Option/Alt key and the tool will revert to polygon mode again. If you want to temporarily revert to freehand lasso mode operation, hold down the Option/Alt key and drag with the mouse. Note that with the polygon lasso tool you don’t have to keep the mouse pressed down as is necessary with the lasso tool. To complete a polygon lasso tool selection, position the cursor directly above the starting point (a small circle icon appears next to the cursor) and click on the start point. When the polygon lasso tool is selected you can click to start the selection, release the mouse and position the cursor to draw a straight line, click to draw another line and so on. Release the Spacebar and you can continue to modify the shape as before. After drawing a selection with the lasso tool, if you hold down the Spacebar this lets you reposition the placement of the selection.
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