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    <h2>Converting to HSV to change the brigthness</h2> <p><strong><a href="http://jsfiddle.net/K8cMX/7/" rel="nofollow noreferrer">See the full code example on jsFiddle</a></strong></p> <p>This version uses <code>HSV</code>. I convert the original <code>rgb</code> value to <code>hsv</code> and change the value of <code>v</code> to get a lighter color. I got <a href="https://stackoverflow.com/questions/2348597/why-doesnt-this-javascript-rgb-to-hsl-code-work/2348659#2348659"><code>RgbToHsv</code></a> from Pointy answer, I just added a little fix for gray. And I got <a href="http://www.csgnetwork.com/csgcolorsel4.html" rel="nofollow noreferrer"><code>HsvToRgb</code> on this website</a></p> <p>When the page loads I am getting the <code>rgb</code> converting into <code>hsv</code> changing the <code>v</code> value, convert back to <code>rgb</code> and change the <code>css</code> of the element with the new value.</p> <pre><code>function AppendColor(light) { $(".dark").each(function(i){ // get the RGB from existing elements var color = $(this).css("background-color"); color = color.replace(/[^0-9,]+/g, ""); var red = color.split(",")[0]; var gre = color.split(",")[1]; var blu = color.split(",")[2]; // convert rgb to hsv var hsv = RgbToHsv(red,gre,blu); // convert hsv to rgb modifing the `v` param var rgb = HsvToRgb(hsv.h, hsv.s, light); // creates a new div and set the new background // then appends to the content color = "rgb(" + rgb.r + "," + rgb.g + "," + rgb.b + ")"; $("&lt;div /&gt;") .css("background", color) .attr("title", color) .appendTo($(".light").parent()); $("&lt;span /&gt;").html(" ").appendTo($(".light").parent()) }); $("&lt;br /&gt;").appendTo($(".light").parent()) } // tested values AppendColor(25); AppendColor(50); AppendColor(75); AppendColor(90); AppendColor(95); AppendColor(97); AppendColor(99); AppendColor(100); </code></pre> <p>Result:</p> <p><img src="https://lh5.ggpht.com/_ztQBKXDrT-w/Tbt0iTwICLI/AAAAAAAAA3Y/H6EafLy_2xI/s600/7f88d7bbd2a64378b8313e9925a7db4c.png" alt="rgb to hsv to rgb"></p> <hr> <h2>Increasing color values by highest color</h2> <p><strong><a href="http://jsfiddle.net/K8cMX/2/" rel="nofollow noreferrer">See this example on jsFiddle</a></strong></p> <p>The <code>divs</code> on top represents the dark colors (rgb) <code>#801A00</code>, <code>#00801A</code>, <code>#1A0080</code> and <code>#D2D2D2</code></p> <pre><code>&lt;div id="red" class="dark red"&gt;&lt;/div&gt; &lt;div id="green" class="dark green"&gt;&lt;/div&gt; &lt;div id="blue" class="dark blue"&gt;&lt;/div&gt; &lt;div id="gray" class="dark gray"&gt;&lt;/div&gt; &lt;br /&gt; &lt;div id="lred" class="lred"&gt;&lt;/div&gt; &lt;div id="lgreen" class="lgreen"&gt;&lt;/div&gt; &lt;div id="lblue" class="lblue"&gt;&lt;/div&gt; &lt;div id="lgray" class="lgray"&gt;&lt;/div&gt; </code></pre> <p>The <code>divs</code> on the bottom will get the light color from the dark.</p> <p>When I click a dark div it will retrieve the <code>background-color</code>, split the values and send to the function <code>Lighthen</code>. This function will make the color more light.</p> <pre><code>function Lighthen(red, green, blue) { var max = ([red,green,blue].sort(function(l,r){return r-l}))[0]; var multiplier = max; multiplier = (multiplier / 255) + 1; // if it would still be too dark, make it lighten more if (multiplier &lt; 1.5) multiplier = 1.9; // if it gets to white, move away a bit if ((max * multiplier) &gt; 255) { multiplier = (multiplier / 230) + 1; } var r = Math.round(red * multiplier); var g = Math.round(green * multiplier); var b = Math.round(blue * multiplier); if (r &gt; 255) r = 255; if (g &gt; 255) g = 255; if (b &gt; 255) b = 255; return "rgb(" + r + "," + g + "," + b + ")"; } </code></pre> <p>When the dark div is clicked, the new color is calculated and changed on the correspondent <code>div</code>.</p> <pre><code>$(".dark").click(function(){ var color = $(this).css("background-color"); color = color.replace(/[^0-9,]+/g, ""); var red = color.split(",")[0]; var gre = color.split(",")[1]; var blu = color.split(",")[2]; $("#l" + $(this).attr("id")) .css("background", Lighthen(red, gre, blu)); }); </code></pre> <p>Resulting in</p> <p><a href="http://jsfiddle.net/K8cMX/2/" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mx6Lj.png" alt="click the color to change"></a></p>
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