Adobe Photoshop CS2 On Demand [Electronic resources]

Working with the Lens Correction Filter

The Lens Correction filter () fixes flaws when shooting images, such as barrel and pincushion distortion, vignetting; even chromatic aberration.

Barrel distortion causes straight lines to bow out toward the edges of the image. On the other hand,

Pincushion distortion has the opposite effect (straight lines bend inward).

Vignetting is a defect where edges of an image are darker than the center.

Chromatic aberration appears as a fringe of color along the edges of objects caused by the lens focusing on different colors of light in different planes. In addition, you can use the Lens Correction filter to rotate an image or fix perspective caused by tilting the camera. Although some of these corrections can be made with the Transform command, the image grid makes adjustments easier.

Use the Lens Correction Filter

Open an image.

Click the

Filter menu, point to

Distort , and then click

Lens Correction .

Select from the following tools:

• Remove Distortion Tool. Click in the grid and then drag left or right to remove barrel or pincushion distortion.

• Straighten Tool. Click in the grid and drag to draw a new horizon line (image will shift to the new horizon).

• Move Grid Tool. Drag to reposition the visible grid.

• Hand Tool. Select the tool, then click and drag to move the image within the view window.

• Zoom Tool. Select the tool, and then click in the view window to zoom in, or Alt+click (Win) or Option+click (Mac) to zoom out.

Select from the following tools:

• Settings. Click and choose from user-defined settings, or to apply the previous settings to the current image.

• Remove Distortion. Drag the slider left or right to precisely remove pincushion or barrel distortion.

Select from the following Chromatic Aberration options:

• Fix Red/Cyan Fringe. Drag left or right to remove a red or cyan fringe from the image.

• Fix Blue/Yellow Fringe. Drag left or right to remove a blue or yellow fringe from the image.

Select from the following Vignette options:

• Amount. Drag left or right to create a light or dark vignette around the image.

• Midpoint. Drag left or right to select the midpoint for the vignette.

Click

Set Lens Default to change the setting to default values.

Select from the following Transform options:

• Vertical Perspective. Drag left or right to change the image's vertical perspective.

• Horizontal Perspective. Drag left or right to change the image's horizontal perspective.

• Angle. Drag the angle option to rotate the image clockwise, or counter clockwise.

• Edge. Click and select to fill in transparent areas of the image with the background color, Edge Extension, or Transparent.

• Scale. Drag left or right to change the scale (size) of the image.

Select the

Preview check box to view changes as they are made.

Select the

Show Grid check box to view or hide the visible grid.

Click the

Size list arrow to change the size of the grid boxes.

Click the

Color box to change the color of the grid.

Click

OK .

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