ADJUST DEPTH OF FIELD with a Lens Blur
ADJUST DEPTH OF FIELD with a Lens Blur filter You can draw the attention of the viewer into the main subject of an image by controlling the depth of field, or defining the part of the image that is in focus and blurring other areas. Photographers control the depth of field by changing the aperture setting on the camera. A small opening results in a greater depth of field with more of the image in focus. A larger aperture creates an image with less depth of field and only the center of the image in focus. You can use Photoshop s blur filters to selectively adjust the depth of field in your digital images. Use the Lens Blur filter and a white-to-black gradient on an Alpha channel to create a smooth transition from the focused areas to the out-of-focus areas in the photo. Click one area in the image to set the main focal point. Areas with the same level of gray in the Alpha channel as the selected area are now in focus. All other areas are blurred depending on the level of gray in the Alpha channel. 33 11 22 128 1 Click the Channels tab in the Layers palette. 2 Click the New Channel button to add a new black Alpha channel. Optionally, you can press the F key once to view the photo against a gray background. The image is covered with black, and the channel is named Alpha 1. 3 Click the Visibility box for the RGB channel to see the image.
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