Adobe Photoshop CS3 - Manual (Page 107)

PHOTOSHOP CS3
User Guide
100
Another type of chromatic artifact affects the edges of specular highlights, such as those found when light is reflected
off of the surface of rippled water or edges of polished metal. This situation usually results in a purple fringe around
each specular highlight. Similar-colored fringing can occur along edges between dark objects and very bright
objects.
1 Zoom into an area near the corner of the preview image. For the best results, the area should contain very dark or
black detail against a very light or white background. Look for the color fringing.
2 In the Lens Corrections tab, adjust any of these controls:
Fix Red/Cyan Fringe Adjusts the size of the red channel relative to the green channel. This compensates for red/cyan
color fringing.
Fix Blue/Yellow Fringe Adjusts the size of the blue channel relative to the green channel. This compensates for
blue/yellow color fringing.
Defringe Desaturates colored fringing around specular highlights. Choose All Edges to correct color fringing for all
edges, including any sharp change in color values. If choosing All Edges results in thin grey lines near edges or other
unwanted effects, choose Highlight Edges to correct color fringing only in edges of highlighting, where fringing is
most likely to occur. Choose Off to turn off defringing.
Look at the preview image as you move each slider left or right. If you’re adjusting red/cyan color fringing, hold down
Alt (Windows) or Option (Mac OS) to hide the blue/yellow color fringing. Similarly, hold down Alt (Windows) or
Option (Mac OS) while adjusting the blue/yellow color fringing to hide the red/cyan color fringing. The goal is to
reduce the color fringing as much as possible.
Compensate for lens vignetting in Camera Raw
Vignetting is a lens defect that causes the edges, especially the corners, of an image to be darker than the center. Use
controls in the Lens Vignetting section of the Lens Correction tab to compensate for vignetting.
1 Increase Amount to lighten the corners, or decrease Amount to darken them.
2 Decrease Midpoint to apply the adjustment to a larger area away from the corners, or increase Midpoint to restrict
the adjustment to an area closer to the corners.
Modifying images with Camera Raw
Rotate images with Camera Raw
• Click the Rotate Image 90˚ Counterclockwise button (or press L).
• Click the Rotate Image 90˚ Clockwise button (or press R).
Note: Using commands in the Edit menu, you can also rotate images in Bridge without opening the Camera Raw dialog box.
Straighten images in Camera Raw
1 In the Camera Raw dialog box, select the Straighten tool .
2 Drag the Straighten tool in the preview image to establish what’s horizontal or vertical.
Note: The Crop tool is active immediately after you use the Straighten tool.