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    <p>Good answers by Spencer and Martin as to the <strong>when</strong> to align your pixels.</p> <p>As to the <strong>how</strong>: I would also point out that one should <em>in WPF 4.0</em> try using the property <strong><code>UseLayoutRounding</code></strong> instead of <code>SnapsToDevicePixels</code>.</p> <p><code>UseLayoutRounding</code> makes what you are doing compatible with Silverlight (<code>SnapsToDevicePixels</code> is not available in Silverlight) ... and Microsoft is also encouraging the use of <code>UseLayoutRounding</code> over <code>SnapsToDevicePixels</code> in its <a href="http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.uselayoutrounding(v=VS.100).aspx" rel="noreferrer">documentation</a>.</p> <p>What is the difference between the two? Well, one big difference is that <code>UseLayoutRounding</code> occurs during the layout phase while <code>SnapsToDevicePixels</code> occurs during the render phase. This makes me speculate that <code>UseLayoutRounding</code> is probably a more performant way to go (I haven't confirmed this, though).</p> <p>All that being said, there will still be reasons to use <code>SnapsToDevicePixels</code>. In fact, the MSDN documentation points to one. I will add another: it is only with <code>SnapsToDevicePixels</code> that you can use guidelines for precise control.</p> <p>Here are some resources on this matter (i.e. pixel snapping and clarity with images, text, and visuals):</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/system.windows.uielement.snapstodevicepixels(v=VS.100).aspx" rel="noreferrer">The MSDN Documentation for the UIElement.SnapsToDevicePixels Property.</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.uselayoutrounding(v=VS.100).aspx" rel="noreferrer">The MSDN Documentation for the FrameworkElement.UseLayoutRounding Property.</a></li> <li><a href="http://blogs.msdn.com/dwayneneed/archive/2007/10/05/blurry-bitmaps.aspx" rel="noreferrer">Here is the old, classic post by Dwayne Need on blurry images.</a></li> <li><a href="https://stackoverflow.com/questions/592017/my-images-are-blurry-why-isnt-wpfs-snapstodevicepixels-working">Sometimes BitmapScalingMode helps with image clarity.</a></li> <li><a href="http://www.wpftutorial.net/DrawOnPhysicalDevicePixels.html" rel="noreferrer">A great blog post that shows you how to actually use SnapsToDevicePixels. It can be tricky.</a></li> <li><a href="http://blogs.msdn.com/text/archive/2010/03/05/additional-wpf-text-clarity-improvements.aspx" rel="noreferrer">A blog post by the WPF Text team about all the different improvements they added to WPF 4.0 in order to help text clarity.</a></li> <li><a href="http://blogs.msdn.com/text/archive/2009/08/27/layout-rounding.aspx" rel="noreferrer">Another blog post by the WPF Text team on layout rounding.</a></li> </ul> <p><em>Heh. I know my answer was a little more than what you were asking for ... but this concept (i.e. resolution independence and the resulting problems it brings and how to get over them) can often be a point of <a href="https://stackoverflow.com/questions/1445114/what-did-you-find-hardest-to-understand-when-learning-wpf/1446230#1446230">frustration</a> when working with WPF. At the very least, I wanted to point you to the new WPF 4.0 property, <code>UseLayoutRounding</code>.</em></p> <p><strong>UPDATE</strong></p> <p>I just have to add since I've seen this over and over ... sometimes <code>SnapsToDevicePixels</code> works when <code>UseLayoutRounding</code> doesn't. I wish I could put a finger on why this is the case, but definitely try UseLayoutRounding first and if that doesn't work, don't hesitate to try <code>SnapsToDevicePixels</code>.</p> <p><em>That line is so sharp it can cut you!</em></p>
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    1. POWhen should I use SnapsToDevicePixels in WPF 4.0?
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    1. COMore = Better in many cases, this is a great answer to many questions I have been having, especially since I am begging to get the feeling that I had better port my WPF/Linq to SQL app over to Silverlight/Linq to EF
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    2. COCould SnapsToDevicePixels=true down WPF performance somehow?
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    3. CO@Peretz probably not noticeably ... but turning it on does add something that must be done/calculated. Maybe the effect would be noticeable if you had a ton of visuals. More likely, though, the perf hit would be lost in the generally bad performance.
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