How to make a selection in Photoshop on Mac: step by step for version 27.11

A selection is an outline that protects everything outside it. Anything inside can be moved, recolored, filtered or masked. Most Photoshop work starts with one, whether you are removing a background, changing a jacket color or sharpening only a face. This guide starts with the fastest route on a Mac, Object Selection, then covers the controls that clean up the result.

Find the selection tools on your Mac

Photoshop keeps its selection tools in the toolbar on the left side of the window. A small triangle in the corner of an icon means more tools are hiding under it. Click and hold that icon, and a flyout menu opens with the rest of the group.

Object Selection sits in the same toolbar slot as Quick Selection. If it is missing, click and hold Quick Selection, then choose Object Selection from the list. An iDownloadBlog tutorial from May 2025 describes the same click and hold setup.

• Object Selection: hover over an object and click it. Photoshop finds the edges for you.
• Quick Selection: paint over an area with a round tip. Best for shapes with clear edges.
• Marquee tools: drag a rectangle or ellipse. Hold Shift while dragging to draw a perfect square or circle.
• Lasso tools: trace the outline by hand when a click will not find the edge.

Make your first selection with Object Selection

Object Selection works best on one subject with a clear edge. A product on a plain background is a good first test. Open the file with File > Open, then click the layer you want to work on in the Layers panel.

Choose Object Selection in the toolbar. Look at the options bar across the top of the window. Turn on Object Finder, Sample All Layers and Hard Edge. Object Finder lights up objects as you hover, so you can click the right one.

Move the pointer over the image. When the object you want shows a colored outline, click it. If the wrong thing lights up, move the pointer slightly until the correct object is highlighted. Photoshop then draws the selection around it.

If Object Finder is off, the tool works differently. You draw first. Drag a rough rectangle or lasso around the object, and Photoshop refines the shape from what sits inside your line. This fallback helps when the object sits in a busy photo.

Add, subtract and intersect with Mac keys

Most selections need a second pass. Hold Shift and drag over a missed area to add it. Hold Option and drag across a part you grabbed by accident to remove it. Hold Shift and Option together to keep only what both areas share.

• Shift: adds the new area to the current selection.
• Option: subtracts the new area from the current selection.
• Shift + Option: keeps only the overlap between the two areas.
• Shift while dragging a Marquee tool: constrains it to a square or circle.
• Command + D: deselects everything. Use it before you start a new subject.
• Command + I: inverts the selection, according to one community guide. Confirm it in the Select menu.

Refine the edge with Select and Mask

Edges decide whether a cutout looks real. Hair, fur, glass and soft shadows need more than a single click. Choose Select > Select and Mask from the Mac menu bar. Photoshop opens the refine panel and shows the result on the canvas.

Inside Select and Mask, the edge controls set how wide and soft the boundary is. Work on one area at a time. Check the result against a plain light background and a dark one to spot halos. Click OK when the edge looks right.

Clean up, deselect and invert

When you finish, clear the selection with Select > Deselect or Command+D. A leftover selection limits every later edit to the same shape. People often forget it and paint on the wrong pixels without noticing.

To select everything outside the object, use Select > Inverse. An Adobe Community Quick Tip from 2022 lists Command+I for this. iDownloadBlog gives a different key and calls its own wording unclear. Test it on a spare file, then trust the key shown in your menu.

When the selection comes out wrong

Most bad selections come from a few causes: the wrong layer, a busy background or a processing setting. Start with the layer. Sample All Layers tells Object Selection to read the visible layers, so the subject is not missed on a separate layer.

Apple silicon Macs add a few known problems. In an Adobe Community thread about an M1 Max, staff suggested running Photoshop in Rosetta emulation mode. One user said turning Rosetta off fixed it, but they needed Rosetta for a legacy plugin. Choose the option your plugins allow.

The thread covers Photoshop 23.1.1 to 23.3.2, so it is old. Its results may not match your build. Test the same image on your own setup before you change any setting.

Mistakes people make on a Mac

• Working on the wrong layer. The selection applies to the layer you clicked, not the one you see.
• Leaving a selection active. Later edits only touch the area inside it.
• Skipping the edge. A hard cutout often shows a bright halo on a new background.
• Mixing up the keys. Shift adds, Option subtracts, and Shift with Option keeps the overlap.
• Refining too early. Get the broad shape right, then work on the edge.

Worked example: cut out a mug on a plain background

Say you have a photo of a white mug on a gray table. Open the file, select the photo layer, and choose Object Selection. Turn on Object Finder, Sample All Layers and Hard Edge. Hover over the mug until it lights up, then click.

Look at the handle. The gap between the handle and the body is often missed. Hold Option and drag over the gap to remove it, or hold Shift and drag over any missed part of the handle. Zoom in to check each pass.

Open Select > Select and Mask, soften the edge a little, and click OK. Then choose Layer > Layer Mask > Reveal Selection. The mug stays visible, the table is hidden, and the original photo stays intact for later edits.

Version and Mac requirements

The latest release at the time of writing is Photoshop 27.11, which CG Channel reported in October 2026. It requires macOS 14.0 or later, and Windows 10 or later. If your Mac runs an older system, check your version before you follow the menu names here.

Photoshop 27.11 adds Enhance Edge in the contextual task bar. It refines masks made by Remove Background. CG Channel says it is not a change to Select and Mask. To cut out a subject without its background, read how to remove background in Photoshop on Mac.

What to do next

Practice on a few photos: a product on white, a person against a wall, and a plant against a sky. Each one teaches a different kind of edge. When your cutout needs a new frame, read how to change canvas size in Photoshop on Mac.

If you do this work every day, the Photoshop page for designers collects workflows and shortcuts. Start with one object and one pass, and widen the job only when the first cutout looks right.