What Is the Lasso Tool in Photoshop Used For?
The Lasso Tool in Adobe Photoshop is a foundational selection feature designed to give users manual control when isolating specific areas or objects within an image. This article explores the core purpose of the Lasso Tool, breaks down its three distinct variations—the standard Lasso, the Polygonal Lasso, and the Magnetic Lasso—and explains how to use these tools effectively for cutting out subjects, making localized color adjustments, and refining complex selections.
Primary Purpose of the Lasso Tool
The primary purpose of the Lasso Tool is to create custom, freeform selections. Unlike geometric tools like the Rectangular or Elliptical Marquee, the Lasso Tool allows you to draw fluid boundaries around irregular shapes. Once an area is selected, you can move, copy, delete, mask, or apply color corrections to that isolated portion of the canvas without altering the surrounding pixels.
The Three Lasso Tool Variations
Photoshop includes three specialized variations of the Lasso Tool, accessible via the toolbar or by pressing the L shortcut on your keyboard:
1. Standard Lasso Tool
The standard Lasso Tool operates like a digital pencil. By clicking and dragging the cursor across the canvas, you can sketch an entirely freehand outline around an object. When you release the mouse button, Photoshop automatically closes the loop with a straight line back to the starting point. It is best suited for quick, rough selections or for working on a graphics tablet where precise hand movements are possible.
2. Polygonal Lasso Tool
The Polygonal Lasso Tool creates selections made entirely of straight-line segments. Clicking on the canvas places an anchor point, and each subsequent click creates a new straight line connecting to the next point. Double-clicking or clicking the origin point closes the selection. This tool is ideal for selecting architectural elements, signs, boxes, furniture, or any object defined by crisp, straight edges.
3. Magnetic Lasso Tool
The Magnetic Lasso Tool automates the tracing process by detecting high-contrast edges between foreground subjects and their backgrounds. As you trace along the perimeter of an object, the tool automatically snaps anchor points to the edge. It is ideal for quickly outlining subjects that stand out sharply against their background, such as dark objects against a bright sky.
Common Use Cases
- Subject Isolation and Cutouts: Quickly separating people, products, or elements from their original backgrounds to place them into new compositions.
- Targeted Adjustments: Isolating uneven or irregular areas—such as shadows, skin, or sky—to apply brightness, curves, or hue/saturation adjustments exclusively to that region.
- Combining and Refining Selections: Adding to or subtracting from existing selections made with automated tools like the Object Selection or Quick Selection Tool by holding Shift (add) or Alt/Option (subtract).
- Vignetting and Soft Edges: Pairing a loose Lasso selection with a feathered edge to create subtle focus effects, spotlights, or vignettes.