Select the Object Selection tool from the toolbar.

Ensure the Object Finder is enabled and hover over the desired object

In the options bar, ensure that the Object Finder is enabled (default behavior: ON). You can then simply hover your pointer over the object in your image that you want to select. Photoshop automatically selects the object as you hover. Click to make the selection.

If you don't want to use the automatic selection, turn off the Object Finder and choose a selection Mode: Rectangle or Lasso and drag along the object to make your selection.

• Rectangle: Drag the pointer to define a rectangular region around the object.
• Lasso: Draw a rough lasso outside the boundary of the object.

Subtract from or add to the selection

In the options bar, click one of the selection options: New, Add To, Subtract From, or Intersect With the selection. New is the default option if nothing is selected. After making the initial selection, the option changes automatically to Add To

Add to the selection: Hold the Shift key or select Add To Selection in the options bar, then hover over/draw a new rectangle or a lasso around the missing region. Repeat this process for all the missing regions you want to add to the selection.

Subtract from the selection: There are two options to subtract from the selection: 

• Use the Subtract From Selection option in the options bar: Hold the Option (Mac)/ Alt (Win) key or select Subtract From Selection in the options bar, then hover over/draw an exact rectangle or a lasso around the boundary of the region you want to subtract from the selection. 
• Enable Object Subtract from the additional options (gear icon in the options bar): Object Subtract is especially useful when removing the background regions inside the current object selection. You can think of the Object Subtract option as equivalent to Object Selection inverted. Turn ON the Object Subtract option in the options bar. Hold the Option (Mac)/ Alt (Win) key or select Subtract From Selection in the options bar, then hover over or draw a rough rectangle or a lasso around the region you want to subtract from the selection.

Choose object selection options

Sample All Layers: Creates a selection based on all layers instead of just the currently selected layer.

Hard Edge: Enables hard edges on the selection boundary.

Further refine the selection edge in the Select And Mask workspace

To further adjust the selection boundary or view the selection against different backgrounds or as a mask, click Select And Mask in the options bar.

Select subjects automatically

Select Subject automatically selects the prominent subjects in your image. To access Select Subject, do one of the following:

• While editing an image, choose Select > Subject.
• While using the Object Selection, Quick Selection, or Magic Wand tools, click Select Subject in the options bar.
• While using the Object  Selection or Quick Selection tools in the Select & Mask workspace, click Select Subject in the options bar.
  

Add to or subtract from the selection

Use any of the Selection tools with their Add to selection and Subtract from selection options to clean up the initial selection, if necessary. See Adjust selections manually.

Fine-tune the selection in the Select and Mask workspace

Choose Select > Select and Mask to open the image in the Select and Mask workspace. Use the tools and sliders in the workspace to clean up the selection further. 

See Select and Mask workspace.

Select the Quick Selection tool  . (If the tool isn't visible, hold down the Magic Wand tool  .)

In the options bar, click one of the selection options: New, Add To, or Subtract From.

New is the default option if nothing is selected. After making the initial selection, the option changes automatically to Add To.

To change the brush tip size, click the Brush pop-up menu in the options bar, and type in a pixel size or drag the slider. Use the Size pop‑up menu options to make the brush tip size sensitive to pen pressure or a stylus wheel.

Choose Quick Selection options:

Sample All Layers: Creates a selection based on all layers instead of just the currently selected layer.

Enhance Edge: Reduces roughness and blockiness in the selection boundary. Enhance Edge automatically flows the selection further toward image edges and applies some of the edge refinement you can apply manually in the Select and Mask workspace.

Paint inside the part of the image you want to select. The selection grows as you paint. If updating is slow, continue to drag to allow time to complete work on the selection. As you paint near the edges of a shape, the selection area extends to follow the contours of the shape edge.

• To subtract from a selection, click the Subtract From option in the options bar, then drag over the existing selection.

• To temporarily switch between add and subtract modes, hold down the Alt (Win) or Option (Mac) key.

• To change the tool cursor, choose Edit > Preferences > Cursors > Painting Cursors (Win) or Photoshop > Preferences > Cursors > Painting Cursors (Mac). Normal Brush Tip displays the standard Quick Selection cursor with a plus or minus sign to show the selection mode.

Click Select and Mask to further adjust the selection boundary. 

Select the Magic Wand tool  . (If the tool isn't visible, access it by holding down the Quick Selection tool  .)

Specify one of the selection options in the options bar. The Magic Wand tool's pointer changes depending on which option is selected.

In the options bar, specify any of the following:

Tolerance: Determines the color range of selected pixels. Enter a value in pixels, ranging from 0 to 255. A low value selects the few colors very similar to the pixel you click. A higher value selects a broader range of colors.

Anti-aliased: Creates a smoother-edged selection.

Contiguous: Selects only adjacent areas using the same colors. Otherwise, all pixels in the entire image using the same colors are selected.

Sample All Layers: Selects colors using data from all the visible layers. Otherwise, the Magic Wand tool selects colors from the active layer only.

In the image, click the color you want to select. If Contiguous is selected, all adjacent pixels within the tolerance range are selected. Otherwise, all pixels in the tolerance range are selected.

Click Select and Mask to further adjust the selection boundary or view the selection against different backgrounds or as a mask.