Adobe 65007312 User Guide - Page 124

Compensate for lens vignetting, Red/Cyan, Blue/Yellow, Defringe

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USING PHOTOSHOP LIGHTROOM 2 119 Developing photos Original photo with blue/yellow fringing (left), and after fixing chromatic aberration (lower right). 1 (Optional) Zoom in to an area near the corner of the photo. For the best results, the area should contain very dark or black detail against a very light or white background. Look for color fringing. 2 Drag the 1:1 image preview in the Detail panel of the Develop module to an area that contains very dark or black detail against a very light or white background. 3 In the Chromatic Aberration area of the Detail panel, adjust any of the following: Red/Cyan Adjusts the size of the red channel relative to the green channel. Compensates for red/cyan color fringing. Blue/Yellow Adjusts the size of the blue channel relative to the green channel. Compensates for blue/yellow color fringing. To more clearly see the color fringing you are trying to correct, press Alt (Windows) or Option (Mac OS) as you move a slider to hide any color fringe corrected by the other color slider. Defringe Choose All Edges to correct color fringing for all edges, including any sharp change in color values. If choosing All Edges results in thin gray lines or other undesired effects, choose Highlight Edges to correct color fringing only in the edges of highlighting where fringing is most likely to occur. Choose Off to turn off defringing. Compensate for lens vignetting Vignetting is a lens defect that causes the edges of an image, especially the corners, to be darker than the center. It is particularly noticeable when the photo contains a subject that is supposed to be an even shade or tone, such as the sky in a landscape image. The Lens Correction sliders in the Vignettes panel of the Develop module allow you to correct these apparent lens distortions. Lens corrections can be applied only to original, uncropped photo edges. Lens corrections adjust exposure values to brighten dark corners. 1 In the Lens Correction area of the Vignettes panel of the Develop module, move the Amount slider to the right (positive values) to lighten the corners of the photo. Move the slider to the left (negative values) to darken the corners of the photo. 2 Move the Midpoint slider to the left (lower value) to apply the Amount adjustment to a larger area away from the corners. Move the slider to the right (higher value) to restrict the adjustment to an area closer to the corners. Updated 03 September 2009

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119
USING PHOTOSHOP LIGHTROOM 2
Developing photos
Original photo with blue/yellow fringing (left), and after fixing chromatic aberration (lower right).
1
(Optional) Zoom in to an area near the corner of the photo. For the best results, the area should contain very dark
or black detail against a very light or white background. Look for color fringing.
2
Drag the 1:1 image preview in the Detail panel of the Develop module to an area that contains very dark or black
detail against a very light or white background.
3
In the Chromatic Aberration area of the Detail panel, adjust any of the following:
Red/Cyan
Adjusts the size of the red channel relative to the green channel. Compensates for red/cyan color fringing.
Blue/Yellow
Adjusts the size of the blue channel relative to the green channel. Compensates for blue/yellow color
fringing.
To more clearly see the color fringing you are trying to correct, press Alt (Windows) or Option (Mac
OS) as you move
a slider to hide any color fringe corrected by the other color slider.
Defringe
Choose All Edges to correct color fringing for all edges, including any sharp change in color values. If
choosing All Edges results in thin gray lines or other undesired effects, choose Highlight Edges to correct color fringing
only in the edges of highlighting where fringing is most likely to occur. Choose Off to turn off defringing.
Compensate for lens vignetting
Vignetting
is a lens defect that causes the edges of an image, especially the corners, to be darker than the center. It is
particularly noticeable when the photo contains a subject that is supposed to be an even shade or tone, such as the sky
in a landscape image. The Lens Correction sliders in the Vignettes panel of the Develop module allow you to correct
these apparent lens distortions.
Lens corrections can be applied
only
to original, uncropped photo edges. Lens corrections adjust exposure values to
brighten dark corners.
1
In the Lens Correction area of the Vignettes panel of the Develop module, move the Amount slider to the right
(positive values) to lighten the corners of the photo. Move the slider to the left (negative values) to darken the
corners of the photo.
2
Move the Midpoint slider to the left (lower value) to apply the Amount adjustment to a larger area away from the
corners. Move the slider to the right (higher value) to restrict the adjustment to an area closer to the corners.
Updated 03 September 2009