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<ul class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WS438DC1E5-3DA4-49a2-A625-A87156D488A3.html" title="Adjust color rendering for your camera in Camera Raw"><img src="images/blank.gif" alt="Previous" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WSFEF02692-1FF6-4fe5-8ACE-836E5C74E8E7.html" title="Compensate for lens vignetting in Camera Raw"><img src="images/blank.gif" alt="Next" width="17" height="17" /></a></li></ul><div class="hierarchy" id="hierarchy"><a href="WSB5C0E258-66DE-4089-9CB0-42F396E2B814.html">Camera Raw</a> /
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                <h1>
                    Compensate for chromatic aberration in Camera Raw
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                <div><div class="section"><p><dfn class="term">Chromatic aberration</dfn> is a common
defect caused by the failure of the lens to focus different frequencies
(colors) to the same spot. In one type of chromatic aberration,
the image from each color of light is in focus, but each image is
a slightly different size. This type of aberration is seen as a
complementary color fringing in areas away from the center of the
image. For example, a red fringe may appear on the side of an object
toward the center of the image, and cyan fringe on the side of the
object away from the center of the image.</p>
<div class="fignone"><img alt="" id="sca_chromatic_abberation" src="images/sca_chromatic_abberation.png" /><div class="figdesc">Original image (top), and after fixing chromatic aberration
(bottom) </div><br /></div><p>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.</p>
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<ol><li class="stepexpand"><span>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.</span></li>
<li class="stepexpand"><span>In the Lens Corrections tab, adjust any of these controls:</span> <dl><dt class="dlterm">Fix Red/Cyan Fringe</dt>
<dd>Adjusts the size of the red channel relative to the green channel.
This compensates for red/cyan color fringing.</dd><p class="dlseparator"></p><dt class="dlterm">Fix Blue/Yellow Fringe</dt>
<dd>Adjusts the size of the blue channel relative to the green channel.
This compensates for blue/yellow color fringing. </dd><p class="dlseparator"></p><dt class="dlterm">Defringe</dt>
<dd>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 gray 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.</dd><p class="dlseparator"></p></dl>
<p>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&#160;OS) to hide the blue/yellow color fringing. Similarly,
hold down Alt (Windows) or Option (Mac&#160;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.</p>
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