
Creating a depth-of-field effect by blurring the background in Photoshop is a popular way to give an image a professional look, similar to a photograph taken with a wide-aperture lens. This step-by-step guide will show you how to achieve that effect using the "Duplicate Image," "Select Subject," "Content-Aware Fill," and "Gaussian Blur" methods. Let’s dive into the detailed process:

Start by opening your image in Photoshop.
In the Layers panel, right-click on the original image layer and select Duplicate Layer.
Name the duplicated layer (e.g., "Blurred Background") to stay organized.
This duplicated layer is where the background blur will be applied, while the original layer remains unchanged, allowing you to easily revert if needed.

Go to Select > Subject. Photoshop will automatically detect the primary subject in your image and create a rough selection around it. This selection might not be perfect, but we’ll refine it shortly.
Click on Select and Mask (found at the top menu or on the options bar). This opens a window where you can refine the selection.
Use tools like the Refine Edge Brush Tool (great for hair and edges) and the Brush Tool to make sure the subject selection is as accurate as possible.
Set the Output To option to Layer Mask and click OK. This creates a mask around the subject on the duplicated layer.

With the "Blurred Background" layer selected, hold down Ctrl (Cmd on Mac) and click on the subject mask thumbnail. This will create a selection around the subject.
Go to Select > Modify > Expand. Expand the selection by 5-10 pixels to ensure the subject edges are smoothly blended with the background after the blur.
With the subject selected, go to Edit > Content-Aware Fill.
Photoshop will fill in the selected area based on the surrounding pixels, removing the subject from the duplicated layer to create a clean background.
Review the preview to ensure the background looks natural. Click OK, then Deselect (Ctrl+D or Cmd+D) once done.
Note: Content-Aware Fill might not be perfect for every image, so you may need to touch up certain areas with the Clone Stamp Tool or Healing Brush Tool if there are visible artifacts.

With the "Blurred Background" layer selected (make sure you’re on the image, not the mask), go to Filter > Blur > Gaussian Blur.
Adjust the Radius slider to control the intensity of the blur. A higher radius creates a stronger blur, which simulates a more shallow depth of field.
Keep an eye on your subject to ensure they remain in focus while the background is sufficiently blurred. You can toggle the blur on and off by previewing different radius values until you achieve the look you want.
If you notice any hard edges around the subject, you can smooth them out.
Go to the Properties panel (with the mask selected) and adjust the Feather slider slightly. This will soften the edge, helping the subject blend more naturally with the background blur.
If you want even more control over the blur effect, you can use Filter > Blur Gallery > Field Blur. This tool allows you to create different levels of blur at different points in the image, creating a more realistic depth of field.
Save the edited image as a PSD file to preserve layers and masks for future edits.
Go to File > Export > Export As and save your image in the desired format (e.g., JPEG, PNG) with the depth-of-field effect applied.
Layer Mask Adjustments: If the mask appears too sharp, use a soft brush on the mask to touch up areas around the subject.
Fine Detail: Pay attention to edges, especially in areas with hair or intricate details, as these require more precise masking for a realistic effect.
Experiment with Blur Radius: Adjust the Gaussian Blur settings to find the most realistic level for your particular image.
By following these steps, you should end up with a beautiful depth-of-field effect that makes your subject pop while keeping the background softly blurred, giving your image a professional, DSLR-like quality.
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