Understanding the Goal
We want to select the portrait (the subject) as accurately as possible. Then, we'll either directly blur the background or isolate the subject onto its own layer, allowing us to blur the background without affecting the subject.
Steps
1. Open the Image in Photoshop: Go to `File > Open` and select the portrait image you want to edit.
2. Duplicate the Background Layer (Important):
* In the Layers panel (usually on the right side), right-click on the "Background" layer and choose "Duplicate Layer..."
* This creates a copy called "Background copy" (or similar). Work on the "Background copy" layer to avoid permanently damaging the original image. This is crucial for non-destructive editing.
3. Select the Magnetic Lasso Tool:
* Find the Lasso Tool in the Tools panel (it looks like a lasso).
* Click and hold on the Lasso Tool icon, and a fly-out menu will appear.
* Choose the "Magnetic Lasso Tool."
4. Adjust Magnetic Lasso Tool Settings (Crucial for a Good Selection):
* Look at the Options Bar at the top of the screen. Here are the settings to adjust:
* Width: This determines how far the lasso tool will reach to find edges. Start with a value like 10 pixels. Adjust this based on the detail in your image. A higher value is good for well-defined edges, while a lower value is better for areas with less contrast.
* Contrast: This tells the tool how much contrast difference it needs to see to "snap" to an edge. A value of 10% is a good starting point. Increase for sharper edges, decrease for softer edges. Experiment!
* Frequency: This determines how many "anchoring points" the tool places along the selection. Higher frequency creates a more detailed selection but can also create more points you need to adjust later. Start with a value of 57.
* Tablet Pressure for Size: If you're using a graphics tablet, enabling this option allows the width of the lasso to change based on the pressure you apply. If you're using a mouse, leave this unchecked.
5. Make the Selection:
* Click once on the edge of the subject (the person in the portrait) to create the starting point of your selection.
* Slowly move your mouse (or pen) along the edge of the subject. The Magnetic Lasso Tool will automatically try to "snap" to the edge, placing anchor points as you go.
* Click to Add Anchor Points Manually: If the Magnetic Lasso Tool is struggling to find the edge, you can click to manually add an anchor point. This is useful in areas with low contrast or similar colors.
* Correct Mistakes:
* Press the Delete (or Backspace) key to remove the last anchor point.
* Hold the Alt (Option on Mac) key while clicking and dragging to temporarily switch to the Polygonal Lasso Tool. This lets you create straight line segments for tricky areas. Release the Alt/Option key to return to the Magnetic Lasso Tool.
* Close the Selection: When you reach the starting point, either:
* Move the cursor over the starting point until you see a small circle appear next to the cursor. Click to close the selection.
* Alternatively, double-click to have Photoshop automatically close the selection.
6. Refine the Selection (VERY IMPORTANT): The Magnetic Lasso Tool is good, but rarely perfect. Use the "Select and Mask" workspace to refine the selection:
* Go to `Select > Select and Mask...`
* View Mode: Choose a view mode that helps you see the edges of your selection clearly. "Overlay" (red overlay) or "On Black" are usually good choices.
* Global Refinements:
* Smooth: Slightly smooths the edges of the selection to reduce jaggedness. Start with a value of `2`.
* Feather: Blurs the edges of the selection slightly. This helps blend the subject with the blurred background. Start with a value of `0.5` to `1` pixel. Increase this value if you see a sharp edge between the subject and the background after blurring.
* Contrast: Increase the contrast to sharpen the edges of the selection. Be careful not to overdo it.
* Shift Edge: Adjusts the selection inward or outward. Use a *negative* value to shrink the selection slightly if you see a halo effect around the subject after blurring. Use a *positive* value if you've accidentally cut off part of the subject.
* Refine Edge Brush Tool (Crucial for Hair and Fur):
* Select the "Refine Edge Brush Tool" (it's in the toolbar on the left side of the Select and Mask workspace, it looks like a paintbrush with a plus sign).
* Paint along the edges of hair, fur, or other detailed areas where the selection is not perfect. This helps Photoshop better identify and select these fine details. Make sure to adjust the brush size in the options bar, for best results.
* Output Settings:
* In the "Output Settings" section, change the "Output To" dropdown to "New Layer with Layer Mask". This will create a new layer with your selected subject and a layer mask defining the selection.
* Click "OK".
7. Blur the Background: Now you have a few options:
* Option 1: Direct Blur (Less Control):
* Select the "Background copy" layer (the layer *underneath* the layer with the mask).
* Go to `Filter > Blur > Gaussian Blur...`
* Adjust the "Radius" slider until you achieve the desired level of blur. Higher radius = more blur. A radius of 5-15 pixels is a good starting point.
* Click "OK".
* Option 2: Separate Background Layer (More Control - Recommended):
* Select the "Background copy" layer.
* Go to `Edit > Copy`.
* Go to `Edit > Paste`. This creates a new layer ("Layer 1" or similar) *above* the "Background copy" layer.
* Select the "Layer 1" layer (the new layer).
* Go to `Filter > Blur > Gaussian Blur...` and blur the background as described above.
* Make sure the layer with the portrait and the layer mask (created in Select and Mask) is above the blurred "Layer 1" layer.
8. Adjust the Layer Mask (If Needed): If you still see imperfections around the edges of the subject:
* Select the layer with the mask (the thumbnail next to the layer name in the Layers panel).
* Select the Brush Tool (B).
* Set the brush color to:
* Black: To hide parts of the layer (refine the edges of the subject if you've accidentally cut off too much).
* White: To reveal parts of the layer (bring back parts of the background if the selection is too tight).
* Adjust the brush size, hardness (softer edges blend better), and opacity as needed.
* Paint on the layer mask to refine the edges of the selection.
9. Optional: Add a Vignette: A vignette (darkening around the edges of the image) can further draw attention to the subject.
* Create a new empty layer above all other layers (Layer > New > Layer).
* Select the Elliptical Marquee Tool.
* Drag to create an oval selection that covers the area *excluding* the subject.
* Go to `Select > Modify > Feather...` and add a feather radius (e.g., 50-100 pixels, depending on the image size).
* Go to `Select > Inverse`. This will select the area *outside* the oval.
* Fill the selection with black (Edit > Fill... Use "Black" as the content).
* Change the layer's blending mode to "Multiply" or "Overlay" (in the Layers panel).
* Adjust the layer's opacity to control the intensity of the vignette.
10. Save Your Work:
* `File > Save As...`
* Save as a Photoshop (.PSD) file to preserve the layers and allow for future editing.
* Save as a JPEG (.JPG) file for sharing or printing (this will flatten the layers).
Tips for Success
* Zoom In: Zoom in to the image (Ctrl + + or Cmd + +) to make precise selections.
* Practice: The Magnetic Lasso Tool takes practice to master. Don't be discouraged if your first few attempts aren't perfect.
* Experiment with Settings: The best settings for the Magnetic Lasso Tool will vary depending on the image. Experiment with different values for Width, Contrast, and Frequency.
* Patience: Take your time and focus on making a clean selection. It will pay off in the end.
* High-Resolution Images: The Magnetic Lasso Tool (and all selection tools) work better with high-resolution images.
* Use a Graphics Tablet: A graphics tablet can provide much finer control than a mouse, especially when selecting complex shapes like hair.
* Consider Alternatives: If you're struggling with the Magnetic Lasso Tool, consider other selection tools like the Quick Selection Tool, the Pen Tool, or even dedicated background removal tools. They often provide better results, especially for complex selections. The Pen Tool (creating paths) offers the highest precision, but it has a steeper learning curve.
By following these steps and practicing, you can effectively blur the background of your portraits using the Magnetic Lasso Tool in Photoshop and create professional-looking results. Remember that refining the selection using the "Select and Mask" workspace is absolutely critical for getting realistic results. Good luck!