• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL

Chapter 14. Manipulating Images with Filters > Using the Lens Blur Filter

Using the Lens Blur Filter

The new Lens Blur filter creates a varying depth of field so that certain objects stay in focus and others areas become blurred. What stays in focus and what blurs is determined by a user-defined selection or alpha channel. When the filter is activated, a depth map is created to determine the 3-dimensional position of the pixels in an image. If you use an alpha channel, the black areas in the alpha channel are at the front of the photo, and the white areas are in the distance. Experiment with selections and alpha channel masks to see how precisely you can control the visual effect of blurring in an image.

Use the Lens Blur Filter

Open a document.

Select the Layers palette, and then select the layer in which you want to apply the Lens Blur.

Create a selection or alpha mask to control the blur.

Click the Filter menu, point to Blur, and then click Lens Blur.

The Lens Blur dialog box opens.

See Also

See “Using the Gaussian Blur and Despeckle Filters” on page 141 for information on using filters.

Select from the following options:

  • Preview. Select Faster to generate quicker preview, or More Accurate to view the image with the filter applied.

  • Depth Map. Select a source from the Source list arrow.

  • Blur Focal Distance. Drag the slider to set the depth to which pixels are in focus. The higher the value the greater the effect.

  • Invert. Inverts the selection or alpha channel.

  • Shape. Select an iris option from the Shape list arrow.

  • Blade Curvature. Drag the slider to smooth out the edges of the iris.

  • Rotation. Drag the slider to rotate the iris.

  • Radius. Drag the slider to add more blur.

  • Brightness. Drag the slider to increase the brightness of the highlights.

  • Amount. Drag the slider to add or remove noise.

  • Threshold. Drag the slider to select a brightness cutoff so that all the pixels that are brighter than that value are treated as highlights.

  • Uniform or Gaussian. Select one or the other to add noise to an image.

  • Monochromatic. Adds noise without affecting the color in your image.

Click OK.



Not a subscriber?

Start A Free Trial

  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint