Before You Begin:
* Open Your Image: Launch Photoshop and open the portrait you want to edit.
* Duplicate Your Layer (Important!) In the Layers panel (usually on the right), right-click on your background layer and select "Duplicate Layer..." Name the duplicate something like "Portrait Layer" or "Subject." This allows you to work non-destructively.
Steps:
1. Select the Magnetic Lasso Tool:
* In the Tools panel (usually on the left), find the Lasso Tool icon.
* Click and hold on the Lasso Tool icon to reveal a flyout menu.
* Choose the Magnetic Lasso Tool.
2. Adjust Magnetic Lasso Tool Settings (Top Toolbar):
* Width: This controls how far away from the edge the tool will try to find a snapping point. A smaller width is good for fine details, a larger width is better for easier selections. Start with something like 10-20 pixels and adjust as needed.
* Contrast: Determines how much contrast the tool needs to see to snap. Higher values snap more strongly to edges with high contrast; lower values are better for smoother transitions. Start around 10% and adjust.
* Frequency: Sets how often the tool places anchor points along the edge. Higher frequency means more anchor points and a more precise selection, but can also make the path harder to edit. Start with 5-7 and experiment.
* Tablet Pressure to Control Size: If you're using a graphics tablet, you can check this box to use pen pressure to control the width of the magnetic lasso. This can be helpful for varying the sensitivity of the edge detection.
3. Start Tracing the Subject:
* Click along the edge of your subject to place your first anchor point.
* Slowly move the mouse (or pen) around the outline of your subject. The Magnetic Lasso Tool will automatically try to snap to the edges of the subject based on the settings you configured. Don't rush. A slow, steady hand will get the best results.
* Correcting Errors:
* If the tool snaps to the wrong area, you can press the Delete or Backspace key to remove the last anchor point and re-draw that section.
* You can also manually place anchor points by clicking the mouse, especially in tricky areas.
4. Close the Selection:
* When you've traced all the way around your subject, bring the cursor back to the starting anchor point. A small circle will appear next to the cursor.
* Click on the starting point to close the selection. You'll now see a selection outline (marching ants) around your subject.
5. Refine the Selection (Select and Mask Workspace - Recommended):
* Go to Select > Select and Mask... This opens a dedicated workspace for refining selections.
* View Mode: Choose a view mode that helps you see the selection clearly (e.g., Overlay, On Layers).
* Edge Detection (Radius): Increase the Radius slightly to allow Photoshop to better detect edges and create a smoother selection. Experiment with the Radius value to find the best balance.
* Global Refinements (Smooth, Feather, Contrast, Shift Edge):
* Smooth: Reduces jagged edges. Use a small value (e.g., 1-3)
* Feather: Softens the selection edge, creating a more natural blend. Use a small value (e.g., 0.5-1)
* Contrast: Sharpens the selection edge. Use sparingly.
* Shift Edge: Moves the selection edge inward or outward. A negative value contracts the selection (useful for removing halos), a positive value expands it. Use sparingly.
* Output Settings:
* Output To: Select "Selection."
* Click OK.
*Alternatively, if you don't want to use Select and Mask*:
* Refine Edge (Older Method): Go to Select > Modify > Feather... and enter a very small feather radius (like 0.5-1 pixel). This can help soften the selection edge and prevent a harsh line.
6. Invert the Selection:
* Go to Select > Inverse. This will select the *background* instead of your subject. Now the "marching ants" should be around the background area.
7. Apply the Blur:
* Go to Filter > Blur > Gaussian Blur...
* A dialog box will appear. Adjust the Radius slider to control the amount of blur. Higher radius values will create a stronger blur.
* Preview the effect. Adjust the radius until you achieve the desired level of blur. Be careful not to over-blur; the goal is a pleasing depth of field effect, not an unrecognizable background.
* Click OK.
8. Optional: Adjust Blur Amount (if needed):
* If you're not happy with the amount of blur, you can use the Fade command to reduce it. Go to Edit > Fade Gaussian Blur... Adjust the opacity slider to reduce the effect.
9. Optional: Correct any artifacts:
* Sometimes you'll get a thin line where the subject meets the blurred background. You can use a small, soft-edged brush with the clone stamp tool to clean this up.
10. Save Your Work:
* Go to File > Save As...
* Choose a format that preserves layers (e.g., .PSD) if you want to be able to edit the image later.
* If you're finished, you can save a flattened copy as a .JPG or .PNG.
Tips and Troubleshooting:
* Patience is Key: Don't rush the selection process, especially around complex areas like hair.
* Zoom In: Zoom in to get a closer view of the edges you're tracing.
* Layer Masks: For more flexibility, consider using a layer mask instead of directly applying the blur to the layer. After inverting the selection (step 6), click the "Add Layer Mask" icon at the bottom of the Layers panel. The blurred background will be on its own layer, and you can edit the mask (using black and white paint) to refine the blur effect.
* Practice: The more you use the Magnetic Lasso Tool, the better you'll become at it.
* Alternatives:
* Quick Selection Tool/Object Selection Tool: These tools are often faster for selecting a subject with good contrast.
* Pen Tool: For the most precise selections, the Pen Tool is the best choice, but it requires more skill and practice.
Why this method works:
The Magnetic Lasso Tool intelligently detects edges based on contrast and color differences, making it easier to select objects from their backgrounds. By blurring the background after selecting the subject, you create a shallow depth of field effect, which draws the viewer's attention to the subject and makes them stand out. Duplicating the layer makes the process non-destructive; that is, you don't edit the original picture.
By following these steps, you should be able to create a professional-looking portrait with a beautifully blurred background!