<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
  PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!--#config errmsg="" --><!-- saved from url=(0022)http://help.adobe.com/ -->
<html lang="en-us">
    <head>
        <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
        <meta name="lang" content="en-us" />
        <meta name="area" content="livedocs" />
        <title>Adobe Photoshop CS4 * Correct lens distortion and adjust perspective</title>
        <meta name="product" content="Photoshop" />
        <meta name="keywords" content="" />
        <script type="text/javascript" language="Javascript" charset="UTF-8"><!--[CDATA[
        var currentTreeNode = "WS3CFA74DE-7F17-4e26-B74E-D27137DC568Fa.html";
// ]]--></script>
<script src="terms.js" type="text/javascript" language="Javascript" charset="UTF-8">...</script> <script src="help.js" type="text/javascript" language="Javascript" charset="UTF-8">...</script>  <script src="utilities.js" type="text/javascript" language="Javascript" charset="UTF-8">...</script> <script src="event.js" type="text/javascript" language="Javascript" charset="UTF-8">...</script> <script src="treeview.js" type="text/javascript" language="Javascript" charset="UTF-8">...</script> <script src="toc.js" language="Javascript" type="text/javascript" charset="UTF-8">..</script> 
<script type="text/javascript">
<!--[CDATA[
var headId = document.getElementsByTagName("head")[0];         
if (use_ie_6_behavior) {
    var linkId = document.createElement("link");
    linkId.href = "content-ie6.css";
    linkId.rel = "stylesheet";
    linkId.type = "text/css";
    headId.appendChild(linkId);
}
function initRoboHelpDOM() {
    if (use_robohelp_behavior) {
        hideElement("searchbar");
        hideElement("hierarchy");
        hideElement("col1");
    }
}
YAHOO.util.Event.onDOMReady(initRoboHelpDOM);
// ]]-->
</script>
<!--#include virtual="/livedocs/ssi/globalheader.ssi" -->
        <link rel="stylesheet" type="text/css" href="tree.css" />
        <link rel="stylesheet" type="text/css" href="content-fonts.css" />
        <link rel="stylesheet" type="text/css" href="content-hyperlinks.css" />
        <link rel="stylesheet" type="text/css" href="content.css" />
        <link rel="stylesheet" type="text/css" href="localeSpecific.css" />
    </head>
    <body id="content_body" onload="window.focus();">
        <a name="top"></a><div id="mnemonic">
            <div class="Photoshop"><table><tr><td class="banner">Adobe Photoshop CS4</td><td class="pod"><img src="images/PDF.gif" width="16" height="16" hspace="15" valign="50%" />&#160;&#160;
                     <a title="PDF" href="http://help.adobe.com/en_US/Photoshop/11.0/photoshop_cs4_help.pdf">
                         PDF (adobe.com) 
                    </a></td></tr></table></div>
        </div>
        <div id="searchbar">
<!-- BEGIN SEARCH CONTENT -->
            <form class="search_form" id="search" name="search" action="search.html" target="_self">
                <img src="images/search.png" />
<script type="text/javascript">
<!--[CDATA[
function clearSearch(){
    if (document.search.q.value == terms_AHV_SEARCH_BUTTON){document.search.q.value = ""}; 
}
document.write('<input class=\"search_input\" \
        name=\"q\" \
        id=\"q\" \
        type=\"text\" \
        maxlength=\"256\" \
        value=\"' + terms_AHV_SEARCH_BUTTON + '\" onclick=\"clearSearch()\"><\/input>'); 
// ]]-->


</script> 
            </form>
        </div>
<!-- BEGIN PAGE CONTENT WRAPPER -->
        <div id="page_content_wrapper">
<!-- BEGIN PAGE WRAPPER -->
<table id="page_content_table">
<tr>
<td id="col1">
<!-- BEGIN IONCOMMENTCOUNT -->
            <div id="ionComCount">
            </div>
<!-- END IONCOMMENTCOUNT -->
<!-- BEGIN GROUP TOC WRAPPER -->
            
<!-- END GROUP TOC WRAPPER -->
<!-- BEGIN NAV WRAPPER -->
            <div id="group_toc">
<script type="text/javascript">
<!--[CDATA[
if ( typeof(terms_BOOK_SHORT) != 'undefined' ) {
  document.write("<p>" + terms_BOOK_SHORT + "<\/p>");
}
// ]]-->


</script> 
            </div>
            <div id="nav_content">
            </div>
<!-- END NAV WRAPPER -->
</td>
<td id="col2">
<!-- BEGIN CONTENT WRAPPER -->
<!-- BEGIN BREADCRUMBS -->
            
            <div id="breadcrumb">
                
<ul class="navigation"><li class="prev"><a accesskey="p" class="prev" href="WS04BE5944-BF2A-41c9-84D8-3D447FF965CEa.html" title="About lens distortion"><img src="images/blank.gif" alt="Previous" width="17" height="17" /></a></li><li class="next"><a accesskey="n" class="next" href="WS22CE3EDE-EC58-40ee-9A34-4083DB365429a.html" title="Reduce image noise and JPEG artifacts"><img src="images/blank.gif" alt="Next" width="17" height="17" /></a></li></ul><div class="hierarchy" id="hierarchy"><a href="WSfd1234e1c4b69f30ea53e41001031ab64-763ea.html">Retouching and transforming</a> /
     <a href="WS3CFA74DE-7F17-4e26-B74E-D27137DC568Fa.html"><b>Correcting image distortion and noise</b></a> 
     </div>

            </div>
<!-- END BREADCRUMBS -->
            <div id="content_wrapper">
<!-- BEGIN PAGE TITLE -->
                <h1>
                    Correct lens distortion and adjust perspective
                </h1>
<!-- END PAGE TITLE -->
                <br clear="both" /><div id="minitoc"><div class="t"><div class="b"><div class="l"><div class="r"><div class="bl"><div class="br"><div class="tl"><div class="tr"><div><h3>Contents [<a href="#" onclick="return toggleMiniToc('minitoc-links', this);" class="hideLink">Hide</a>]</h3><ul id="minitoc-links"><li><p><a href="#WS77A53347-7945-490b-96BB-802EEEE10D82a"><h1 class="topictitle1">Correct image perspective and lens flaws</h1>
</a></p></li><li><p><a href="#WSF8BE342A-7C11-486d-BC2F-2DA2A6588335a"><h1 class="topictitle1">Adjust the Lens Correction preview and grid</h1>
</a></p></li><li><p><a href="#WS400BC7AF-41F0-46bb-B90B-F96D65F237F4a"><h1 class="topictitle1">Set camera and lens defaults</h1>
</a></p></li></ul></div></div><br clear="both" /></div></div></div></div></div></div></div></div><br clear="both" /><div><div class="section"><p>The
Lens Correction filter fixes common lens flaws such as barrel and
pincushion distortion, vignetting, and chromatic aberration. The
filter works with 8‑bits and 16‑bits-per-channel images only.</p>
<p>You
can also use the filter to rotate an image or fix image perspective
caused by vertical or horizontal camera tilt. The filter’s image
grid makes these adjustments easier and more accurate than using
the Transform command.</p>
</div>
</div>
<div id="WS77A53347-7945-490b-96BB-802EEEE10D82a" class="nochunk"><a name="WS77A53347-7945-490b-96BB-802EEEE10D82a"></a><h3 class="topictitle3">Correct image perspective and lens flaws</h3><div><ol><li class="stepexpand"><span>Choose
Filter&#160;&gt; Distort&#160;&gt; Lens Correction.</span></li>
<li class="stepexpand"><span>Set the grid and image zoom. As you work you may want
to adjust the grid lines to help you judge the amount of correction
to make. See Adjust the Lens Correction preview and grid, below.</span></li>
<li class="stepexpand"><span>(Optional) Choose a preset list of settings from the
Settings menu. Lens Default uses settings that you previously saved
for the camera, lens, focal length, and f‑stop combination used
to make the image. Previous Conversion uses the settings used in
your last lens correction. Any group of custom settings you saved
are listed at the bottom of the menu. See Set camera and lens defaults,
below.</span></li>
<li class="stepexpand"><span>Set any of the following options to correct your image.</span> <dl><dt class="dlterm">Remove Distortion</dt>
<dd>Corrects lens barrel or pincushion distortion. Move the slider
to straighten horizontal and vertical lines that bend either away
from or toward the center of the image. You can also use the Remove
Distortion tool&#160;<img src="images/P_LensDistort_Lg_N.png" /> to
make this correction. Drag toward the center of the image to correct
for barrel distortion and toward the edge of the image to correct
for pincushion distortion. Adjust the Edge option to specify how
you want to handle any resulting blank image edges.</dd><p class="dlseparator"></p><dt class="dlterm">Chromatic Aberration</dt>
<dd>Corrects color fringing. Zoom in on the image preview to
get a closer view of the fringing as you make the correction.</dd><p class="dlseparator"></p><dt class="dlterm">Fix Red/Cyan Fringe</dt>
<dd>Compensates for red/cyan color fringing by adjusting
the size of the red channel relative to the green channel.</dd><p class="dlseparator"></p><dt class="dlterm">Fix Blue/Yellow Fringe</dt>
<dd>Compensates for blue/yellow color fringing by adjusting
the size of the blue channel relative to the green channel.</dd><p class="dlseparator"></p><dt class="dlterm">Vignette</dt>
<dd>Corrects images that have darkened edges caused by lens
faults or improper lens shading.</dd><p class="dlseparator"></p><dt class="dlterm">Amount</dt>
<dd>Sets the amount of lightening or darkening along the
edges of an image.</dd><p class="dlseparator"></p><dt class="dlterm">Midpoint</dt>
<dd>Specifies the width of area affected by the Amount slider.
Specify a lower number to affect more of the image. Specify a higher
number to restrict the effect to the edges of the image.</dd><p class="dlseparator"></p><dt class="dlterm">Vertical Perspective</dt>
<dd>Corrects image perspective caused by tilting the camera up
or down. Makes vertical lines in an image parallel.</dd><p class="dlseparator"></p><dt class="dlterm">Horizontal Perspective</dt>
<dd>Corrects image perspective, making horizontal lines parallel.</dd><p class="dlseparator"></p><dt class="dlterm">Angle</dt>
<dd>Rotates the image to correct for camera tilt or to make
adjustments after correcting perspective. You can also use the Straighten
tool&#160;<img src="images/P_LensRotate_Lg_N.png" /> to
make this correction. Drag along a line in the image that you want
to make vertical or horizontal.</dd><p class="dlseparator"></p><dt class="dlterm">Edge</dt>
<dd>Specifies how to handle the blank areas that result from
pincushion, rotation, or perspective corrections. You can fill blank
areas with transparency or a color (background color), or you can
extend the edge pixels of the image.</dd><p class="dlseparator"></p><dt class="dlterm">Scale</dt>
<dd>Adjusts the image scale up or down. The image pixel dimensions
aren’t changed. The main use is to remove blank areas of the image
caused by pincushion, rotation, or perspective corrections. Scaling
up effectively results in cropping the image and interpolating up
to the original pixel dimensions.</dd><p class="dlseparator"></p></dl>
</li>
</ol>
</div></div>
<div id="WSF8BE342A-7C11-486d-BC2F-2DA2A6588335a" class="nochunk"><a name="WSF8BE342A-7C11-486d-BC2F-2DA2A6588335a"></a><h3 class="topictitle3">Adjust the Lens Correction preview and grid</h3><div><ul><li><span>To change the image preview
magnification, use the Zoom tool or the zoom controls in the lower
left side of the preview image. </span></li>
<li><span>To move the image in the preview window, select the Hand
tool and drag in the image preview.</span></li>
<li><span>To use the grid, select Show Grid at the bottom of the
dialog box. Use the Size control to adjust the grid spacing and
the Color control to change the color of the grid. You can move
the grid to line it up with your image using the Move Grid tool&#160;<img src="images/P_LensMoveGrid_Lg_N.png" />.</span></li>
</ul>
</div></div>
<div id="WS400BC7AF-41F0-46bb-B90B-F96D65F237F4a" class="nochunk"><a name="WS400BC7AF-41F0-46bb-B90B-F96D65F237F4a"></a><h3 class="topictitle3">Set camera and lens defaults</h3><div><div class="section"><p>You can save the settings in the Lens Correction
dialog box to reuse with other images made with the same camera,
lens, and focal length. Photoshop saves settings for distortion,
vignetting, and chromatic aberration. Perspective correction settings
are not saved. You can save and reuse settings in two ways:</p>
<ul><li><p>Manually save and load settings. Set options in the dialog
box, and then choose Save Settings from the Settings menu&#160;<img src="images/P_OSXFlyoutBtn_N.png" />. To
use the saved settings, choose them from the Settings menu. You
can also load saved settings that don’t appear in the menu using
the Load Settings command in the Settings menu.</p>
</li>
<li><p>Set a lens default. If your image has EXIF metadata for the
camera, lens, focal length, and f‑stop, you can save the current
settings as a lens default. To save the settings, click the Set
Lens Default button. When you correct an image that matches the
camera, lens, focal length, and f‑stop, the Lens Default option becomes
available in the Settings menu. This option is not available if
your image doesn’t have EXIF metadata.</p>
</li>
</ul>
</div>
</div></div>

                <div id="related">
                    <div class="separator"><a href="#"><img src="images/BTT.jpg" /></a>&#160;</div>
                    
                    
                </div>
                <div id="footer">
                    <p><img src="images/Community.png" />&#160;<a title="community help (adobe.com)" href="http://www.adobe.com/go/lr_Photoshop_community_en">community help (adobe.com)</a></p>
<!-- BEGIN IONCOMMENTS -->
                    <div id="ionComHere">
                    </div>
<!-- END IONCOMMENTS -->
<!--#include virtual="ionComments.ssi" -->
                    <p id="creativecommons"><a href="http://creativecommons.org/licenses/by-nc-sa/3.0/" id="creativecommons_text"><img id="creativecommons_img" src="images/CC.png" alt="This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License" /></a></p>
                </div>
            </div>
<!-- END CONTENT WRAPPER -->
</td>
</tr>
</table>
        </div>
<!-- END PAGE CONTENT WRAPPER -->
<script type="text/javascript">
<!--[CDATA[
scrollToNameAnchor();
// ]]-->
</script> 
<!--#include virtual="/livedocs/ssi/globalfooter.ssi" -->
<!--#include virtual="/ubi/analytics/analytics_ssi.html" -->
    </body>
</html>