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How to Use the Magnetic Lasso Tool for Tricky Edge Selections

4 min read

Why the Magnetic Lasso Tool Makes Difficult Selections Easy

Have you ever tried to select someone standing against a busy background? Maybe your grandson at the park, or the family dog lounging on a patterned rug? Drawing around every curve and edge by hand feels impossible — your mouse wiggles, and the selection looks jagged.

That is exactly why Adobe built the Magnetic Lasso Tool into Photoshop Elements. This clever tool watches where edges meet in your photo and snaps your selection line right to them, almost like a magnet finding metal. You guide the general direction, and PSE handles the precision.

Once you master this tool, you will be able to cut out people, pets, and objects from tricky backgrounds without frustration — perfect for creating custom photo gifts or swapping in a prettier sky behind your vacation shots.

Where to Find the Magnetic Lasso Tool in PSE

The Magnetic Lasso Tool lives in the toolbox on the left side of your screen. In Advanced mode, look for the Lasso icon — it looks like a small rope loop.

  1. 1Click and hold on the Lasso Tool icon in the toolbox.
  2. 2A small flyout menu appears showing three options: Lasso Tool, Polygonal Lasso Tool, and Magnetic Lasso Tool.
  3. 3Select Magnetic Lasso Tool — it has a tiny magnet icon beside the lasso.

You can also press the letter L on your keyboard repeatedly to cycle through the three lasso variants until you reach the Magnetic version.

How the Magnetic Lasso Works

Unlike the regular Lasso, which follows your mouse exactly, the Magnetic Lasso looks at the contrast between colours and tones in your image. As you move near an edge — say, where your daughter's red jacket meets a grey wall — the tool detects that contrast and places tiny anchor points along the boundary automatically.

You do not need to click constantly. Simply move your mouse close to the edge, and Photoshop Elements does the precise work for you. This makes it ideal for:

  • Curly or wavy hair against a plain wall
  • Pets with fuzzy outlines
  • Clothing edges, hats, or accessories
  • Architectural shapes with clear lines

Step-by-Step: Selecting a Subject with the Magnetic Lasso

Let us walk through a practical example — selecting your granddaughter so you can place her in front of a different background.

  1. 1Open your photo in Photoshop Elements and switch to Advanced mode using the mode tabs at the top.
  2. 2Choose the Magnetic Lasso Tool from the toolbox as described above.
  3. 3In the Tool Options bar at the bottom, set Feather to 0 px for a crisp edge, or 1–2 px for a softer blend. Leave Width at around 10 px and Contrast at 10% to start.
  4. 4Click once on the edge of your subject — for example, the shoulder of your granddaughter's shirt.
  5. 5Slowly move your mouse along the outline without holding down the button. Watch as PSE places small square anchor points along the edge automatically.
  6. 6If the tool misses an edge, click manually to add an anchor point exactly where you want it.
  7. 7To remove a misplaced point, press the Delete or Backspace key to step backwards one point at a time.
  8. 8Continue around the entire subject until you return to your starting point.
  9. 9Click on the starting point — or double-click anywhere — to close the selection. You will see the familiar marching ants around your subject.

Fine-Tuning Your Selection

No selection is perfect on the first try, and that is completely normal. Photoshop Elements gives you easy ways to refine it:

  • Add to selection: Hold Shift and draw around any missed areas.
  • Subtract from selection: Hold Alt (Windows) or Option (Mac) and draw around parts you want to remove.
  • Refine Edge: Go to Select → Refine Edge for advanced smoothing, feathering, and edge detection — especially helpful for flyaway hair.

Practical Tips for Better Results

  • Zoom in before you start. Use View → Zoom In or press Ctrl + (Windows) or Cmd + (Mac) so you can see edges clearly.
  • Work in short segments. If your subject has complicated areas — like fingers or detailed patterns — click more often to add manual anchor points in tricky spots.
  • Adjust Width and Contrast in the Tool Options. A higher Width value (like 20 px) makes the tool search a larger area for edges, useful for soft, blurry boundaries. A higher Contrast value (like 20%) makes the tool more sensitive to sharp edges.
  • Start on a high-contrast edge. Begin your selection where the difference between subject and background is most obvious — the tool will have an easier time finding the line.

When to Use the Magnetic Lasso vs Other Selection Tools

The Magnetic Lasso Tool shines when your subject has clear but irregular edges — think curly hair, ruffled clothing, or the curved outline of a pet. It is faster than the regular Lasso because you do not need to trace every pixel yourself.

For geometric shapes with straight lines, the Polygonal Lasso Tool is often quicker. For very simple backgrounds, the Quick Selection Tool or Magic Wand may work with a single click. But for those in-between situations — where edges are clear but complex — the Magnetic Lasso in Photoshop Elements is your best friend.

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