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    <h2>border-radius</h2> <p>CSS3 <code>border-radius</code> can be used to create a round div with a background image which serves as the image spotlight. The spotlight can be overlaid on top of the main image, and positioned based on the mouse coordinates. <a href="http://jsfiddle.net/CkJXJ/3/" rel="noreferrer">JSFiddle Demo</a></p> <p>Although there's no natural way to soften the edges of the spotlight in CSS3 -- which would require support for adding an opacity gradient to arbitrary content -- it can be simulated using a staggered set of elements with increasing radius and decreasing opacity. <a href="http://jsfiddle.net/ga2D2/3/" rel="noreferrer">Updated demo with softened edges</a></p> <p>In the <a href="http://jsfiddle.net/ga2D2/3/" rel="noreferrer">updated demo</a>, the size and softness of the the spotlight can be adjusted using the following variables:</p> <pre><code>var spotlightDiameter = 150; // Base size (not including the soft edge) var numSpotlightLayers = 6; // More layers = softer edges var spotlightLayerThickness = 2; // Thinner = the softening is more subtle </code></pre> <p>Here's a <a href="http://jsfiddle.net/bu7rd/" rel="noreferrer">modified demo</a> where the spotlight has noticeable ripples. The thickness of the layers was increased to show more clearly how it works.</p> <p>Below is a simplified version of the code for the initial version with sharp edges.</p> <p><strong>HTML</strong></p> <pre><code>&lt;div class="content"&gt; &lt;div class="spotlight"&gt;&lt;/div&gt; &lt;/div&gt; </code></pre> <p><strong>CSS</strong></p> <pre><code>.content { position: relative; width: 640px; height: 480px; background: url(desaturated.jpg) no-repeat 0 0; overflow: hidden; } .spotlight { display: none; position: absolute; background: url(overly_saturated.jpg) no-repeat 0 0; } </code></pre> <p><strong>jQuery</strong></p> <pre><code>var spotlightDiameter = 150; // Update the spotlight position on mousemove $('.content').on('mousemove', function(e){ var center = {x: e.pageX - this.offsetLeft, y: e.pageY - this.offsetTop}; var x = center.x - (spotlightDiameter &gt;&gt; 1); var y = center.y - (spotlightDiameter &gt;&gt; 1); $('.spotlight').css({left: x + 'px', top: y + 'px', backgroundPosition: -x + 'px ' + -y + 'px'}).show(); }); // Hide the spotlight on mouseout $('.content').on('mouseout', function(e){ $('.spotlight').hide(); }); // Initialize the spotlight $(document).ready(function(){ $('.spotlight').width(spotlightDiameter + 'px') .height(spotlightDiameter + 'px') .css({borderRadius: (spotlightDiameter &gt;&gt; 1) + 'px'}); }); </code></pre> <h2>Alternative implementations</h2> <p>This could also be implemented using HTML5 Canvas or SVG. Below is a browser-support comparison of the different approaches:</p> <ul> <li><code>border-radius</code>: Not supported by <a href="http://caniuse.com/#search=border-radius" rel="noreferrer">IE8 or earlier</a>.</li> <li>HTML5 Canvas: Not supported by <a href="http://caniuse.com/#search=canvas" rel="noreferrer">IE8 or earlier</a>.</li> <li>SVG: Not supported by <a href="http://caniuse.com/#search=svg" rel="noreferrer">IE8 or earlier</a>, or <a href="http://caniuse.com/#search=svg" rel="noreferrer">Android 2.3 or earlier</a> (which is still most of the <a href="http://developer.android.com/about/dashboards/index.html" rel="noreferrer">Android marketshare</a>).</li> </ul> <p>In short, IE8 and earlier is not an option for any of these approaches, and if Android support is needed, that limits the choices to <code>border-radius</code> and HTML5 Canvas. Of course, since this is mouse-based, Android support may not be a factor anyhow.</p>
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    1. POCreating a circular mouseover saturation effect
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    1. USMatt Coughlin
    1. USMatt Coughlin
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    1. CO+1 Very nice work.
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    2. COThat's great! Would it be possible to soften the edges of the circle?
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      1. USConfused One
    3. CO@ConfusedOne: There's no natural way to do this in CSS (an image with an opacity gradient), but it can be simulated using a staggered set of elements with increasing radius and decreasing opacity. I added an updated demo with softer edges and a photo that's more suitable for this type of effect. The amount of softness is configurable.
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