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    <p>An aside: RGB is not a perceptually linear color space. I recommend converting from RGB to HSL, interpolating, then converting back to RGB. I wrote the following PHP code to generate arbitrary perceptually-correct gradients; I suggest turning it into a service which can then be called from PHP or AJAX at need.</p> <p>You can get your final hex output as</p> <pre><code>$hexcol = col2string( RGBinterpolate("#ececec", "#ffffff", 0.5) ); // "#f4f4f4" </code></pre> <p>The code:</p> <pre><code>// Input: // $start as RGB color string, // $end as RGB color string, // $dist as float in [0.0 .. 1.0] being % distance between start and end colors // Output: // array(int, int, int) being the resulting color in RGB) function RGBinterpolate( $start, $end, $dist ) { $hsl_start = rgb2hsl( getCol($start) ); $hsl_end = rgb2hsl( getCol($end) ); // choose the shorter arc of the hue wheel! if ($hsl_start[0] &gt; $hsl_end[0]) { if ($hsl_start[0] &gt; $hsl_end[0] + 0.5) $hsl_start[0] -= 1.0; } else { if ($hsl_end[0] &gt; $hsl_start[0] + 0.5) $hsl_end[0] -= 1.0; } // do linear interpolation in hsl color space $hs = interp( $hsl_start[0], $hsl_end[0], $dist ); $ss = interp( $hsl_start[1], $hsl_end[1], $dist ); $ls = interp( $hsl_start[2], $hsl_end[2], $dist ); return hsl2rgb( array( $hs, $ss, $ls ) ); } // Input: start-value, end-value, % distance as float in [0.0 .. 1.0] // Output: result of interpolation as float function interp($start, $end, $dist) { return $start + ($end - $start)*$dist; } // Input: string in one of the following formats: // #XXXXXX (standard hex code as used in CSS) // 0xXXXXXX (same thing written as C longint) // #XXX (equivalent to each-digit-doubled, ie #abc is #aabbcc) // 000, 000, 000 (decimal triad, each value in 0..255) // colorname (Netscape defined color names) // Output: array(int, int, int) for legal values, else default value function getCol($str, $default=array(0,0,0)) { global $namedcolors; // convert named color to #xxxxxx code if( isset($namedcolors[$str]) ) $str = $namedcolors[$str]; // turn named color into a hex value $str = trim($str); // remove leading and trailing whitespace $hex = "[0-9a-z]"; // attempt to match #XXXXXX $pat = "/(#)($hex{2})($hex{2})($hex{2})/i"; if ((preg_match($pat, $str, $arr)) == 1) { $r = hexdec($arr[2]); $g = hexdec($arr[3]); $b = hexdec($arr[4]); return array($r, $g, $b); } // attempt to match 0xXXXXXX $pat = "/(0x)($hex{2})($hex{2})($hex{2})/i"; if ((preg_match($pat, $str, $arr)) == 1) { $r = hexdec($arr[2]); $g = hexdec($arr[3]); $b = hexdec($arr[4]); return array($r, $g, $b); } // attempt to match #XXX $pat = "/(#)($hex)($hex)($hex)/i"; if ((preg_match($pat, $str, $arr)) == 1) { $r = hexdec($arr[2]) * 17; $g = hexdec($arr[3]) * 17; $b = hexdec($arr[4]) * 17; return array($r, $g, $b); } // attempt to match int, int, int $pat = "/(\d{1,3})\\s*,\\s*(\d{1,3})\\s*,\\s*(\d{1,3})/i"; if ((preg_match($pat, $str, $arr)) == 1) { $r = 0 + $arr[2]; // implicit cast to int - make explicit? $g = 0 + $arr[3]; $b = 0 + $arr[4]; return array($r, $g, $b); } // if none of the above worked, return default value return $default; } // Input: array(int,int,int) being RGB color in { [0..255], [0..255], [0..255] } // Output array(float,float,float) being HSL color in { [0.0 .. 1.0), [0.0 .. 1.0), [0.0 .. 1.0) } function rgb2hsl($rgbtrio) { $r = $rgbtrio[0] / 256.0; // Normalize {r,g,b} to [0.0 .. 1.0) $g = $rgbtrio[1] / 256.0; $b = $rgbtrio[2] / 256.0; $h = 0.0; $s = 0.0; $L = 0.0; $min = min($r, $g, $b); $max = max($r, $g, $b); $delta = $max - $min; $L = 0.5 * ( $max + $min ); if ( $delta &lt; 0.001 ) // This is a gray, no chroma... { $h = 0.0; // ergo, hue and saturation are meaningless $s = 0.0; } else // Chromatic data... { if ( $L &lt; 0.5 ) $s = ($max - $min) / ( $max + $min ); else $s = ($max - $min) / ( 2 - $max - $min ); $dr = ( (($max - $r) / 6.0) + ($max / 2.0) ) / $max; $dg = ( (($max - $g) / 6.0) + ($max / 2.0) ) / $max; $db = ( (($max - $b) / 6.0) + ($max / 2.0) ) / $max; if ($r == $max) $h = $db - $dg; elseif ($g == $max) $h = (0.3333) + $dr - $db; elseif ($b == $max) $h = (0.6666) + $dg - $dr; if ( $h &lt; 0.0 ) $h += 1.0; if ( $h &gt; 1.0 ) $h -= 1.0; } return array($h, $s, $L); } function Hue_2_RGB( $v1, $v2, $vH ) { $v1 = 0.0+$v1; $v2 = 0.0+$v2; $vH = 0.0+$vH; if ( $vH &lt; 0.0 ) $vH += 1.0; elseif ( $vH &gt;= 1.0 ) $vH -= 1.0; // 0.0 &lt;= vH &lt; 1.0 if ( $vH &lt; 0.1667 ) return ( $v1 + 6.0*$vH*($v2 - $v1) ); elseif ( $vH &lt; 0.5 ) return ( $v2 ); elseif ( $vH &lt; 0.6667 ) return ( $v1 + (4.0-(6.0*$vH ))*($v2 - $v1) ); else return ( $v1 ); } // Input: array(float,float,float) being HSL color in { [0.0 .. 1.0), [0.0 .. 1.0), [0.0 .. 1.0) } // Output: array(int,int,int) being RGB color in { [0..255], [0..255], [0..255] } function hsl2rgb($hsltrio) { $h = $hsltrio[0]; $s = $hsltrio[1]; $L = $hsltrio[2]; if ( $s &lt; 0.001 ) //HSL from 0 to 1 { $r = $L; $g = $L; $b = $L; } else { if ( $L &lt; 0.5 ) $j = $L * ( 1.0 + $s ); else $j = ($L + $s) - ($s * $L); $i = (2.0 * $L) - $j; $r = Hue_2_RGB( $i, $j, $h + 0.3333 ); $g = Hue_2_RGB( $i, $j, $h ); $b = Hue_2_RGB( $i, $j, $h - 0.3333 ); } return array( floor(256.0 * $r), floor(256.0 * $g), floor(256.0 * $b) ); } function col2string($rgbtrio) { global $colornames; $r = floor( $rgbtrio[0] ); $g = floor( $rgbtrio[1] ); $b = floor( $rgbtrio[2] ); $str = sprintf("#%02x%02x%02x", $r, $g, $b); if( isset($colornames[$str]) ) return $colornames[$str]; else return $str; } // All Netscape named colors $namedcolors = array( "aliceblue" =&gt; "#f0f8ff", "antiquewhite" =&gt; "#faebd7", "aqua" =&gt; "#00ffff", "aquamarine" =&gt; "#7fffd4", "azure" =&gt; "#f0ffff", "beige" =&gt; "#f5f5dc", "bisque" =&gt; "#ffe4c4", "black" =&gt; "#000000", "blanchedalmond" =&gt; "#ffebcd", "blue" =&gt; "#0000ff", "blueviolet" =&gt; "#8a2be2", "brown" =&gt; "#a52a2a", "burlywood" =&gt; "#deb887", "cadetblue" =&gt; "#5f9ea0", "chartreuse" =&gt; "#7fff00", "chocolate" =&gt; "#d2691e", "coral" =&gt; "#ff7f50", "cornflowerblue" =&gt; "#6495ed", "cornsilk" =&gt; "#fff8dc", "crimson" =&gt; "#dc143c", "cyan" =&gt; "#00ffff", "darkblue" =&gt; "#00008b", "darkcyan" =&gt; "#008b8b", "darkgoldenrod" =&gt; "#b8860b", "darkgray" =&gt; "#a9a9a9", "darkgreen" =&gt; "#006400", "darkgrey" =&gt; "#a9a9a9", "darkkhaki" =&gt; "#bdb76b", "darkmagenta" =&gt; "#8b008b", "darkolivegreen" =&gt; "#556b2f", "darkorange" =&gt; "#ff8c00", "darkorchid" =&gt; "#9932cc", "darkred" =&gt; "#8b0000", "darksalmon" =&gt; "#e9967a", "darkseagreen" =&gt; "#8fbc8f", "darkslateblue" =&gt; "#483d8b", "darkslategray" =&gt; "#2f4f4f", "darkslategrey" =&gt; "#2f4f4f", "darkturquoise" =&gt; "#00ced1", "darkviolet" =&gt; "#9400d3", "deeppink" =&gt; "#ff1493", "deepskyblue" =&gt; "#00bfff", "dimgray" =&gt; "#696969", "dimgrey" =&gt; "#696969", "dodgerblue" =&gt; "#1e90ff", "firebrick" =&gt; "#b22222", "floralwhite" =&gt; "#fffaf0", "forestgreen" =&gt; "#228b22", "fuchsia" =&gt; "#ff00ff", "gainsboro" =&gt; "#dcdcdc", "ghostwhite" =&gt; "#f8f8ff", "gold" =&gt; "#ffd700", "goldenrod" =&gt; "#daa520", "gray" =&gt; "#808080", "green" =&gt; "#008000", "greenyellow" =&gt; "#adff2f", "grey" =&gt; "#808080", "honeydew" =&gt; "#f0fff0", "hotpink" =&gt; "#ff69b4", "indianred" =&gt; "#cd5c5c", "indigo" =&gt; "#4b0082", "ivory" =&gt; "#fffff0", "khaki" =&gt; "#f0e68c", "lavender" =&gt; "#e6e6fa", "lavenderblush" =&gt; "#fff0f5", "lawngreen" =&gt; "#7cfc00", "lemonchiffon" =&gt; "#fffacd", "lightblue" =&gt; "#add8e6", "lightcoral" =&gt; "#f08080", "lightcyan" =&gt; "#e0ffff", "lightgoldenrodyellow" =&gt; "#fafad2", "lightgray" =&gt; "#d3d3d3", "lightgreen" =&gt; "#90ee90", "lightgrey" =&gt; "#d3d3d3", "lightpink" =&gt; "#ffb6c1", "lightsalmon" =&gt; "#ffa07a", "lightseagreen" =&gt; "#20b2aa", "lightskyblue" =&gt; "#87cefa", "lightslategray" =&gt; "#778899", "lightslategrey" =&gt; "#778899", "lightsteelblue" =&gt; "#b0c4de", "lightyellow" =&gt; "#ffffe0", "lime" =&gt; "#00ff00", "limegreen" =&gt; "#32cd32", "linen" =&gt; "#faf0e6", "magenta" =&gt; "#ff00ff", "maroon" =&gt; "#800000", "mediumaquamarine" =&gt; "#66cdaa", "mediumblue" =&gt; "#0000cd", "mediumorchid" =&gt; "#ba55d3", "mediumpurple" =&gt; "#9370db", "mediumseagreen" =&gt; "#3cb371", "mediumslateblue" =&gt; "#7b68ee", "mediumspringgreen" =&gt; "#00fa9a", "mediumturquoise" =&gt; "#48d1cc", "mediumvioletred" =&gt; "#c71585", "midnightblue" =&gt; "#191970", "mintcream" =&gt; "#f5fffa", "mistyrose" =&gt; "#ffe4e1", "moccasin" =&gt; "#ffe4b5", "navajowhite" =&gt; "#ffdead", "navy" =&gt; "#000080", "oldlace" =&gt; "#fdf5e6", "olive" =&gt; "#808000", "olivedrab" =&gt; "#6b8e23", "orange" =&gt; "#ffa500", "orangered" =&gt; "#ff4500", "orchid" =&gt; "#da70d6", "palegoldenrod" =&gt; "#eee8aa", "palegreen" =&gt; "#98fb98", "paleturquoise" =&gt; "#afeeee", "palevioletred" =&gt; "#db7093", "papayawhip" =&gt; "#ffefd5", "peachpuff" =&gt; "#ffdab9", "peru" =&gt; "#cd853f", "pink" =&gt; "#ffc0cb", "plum" =&gt; "#dda0dd", "powderblue" =&gt; "#b0e0e6", "purple" =&gt; "#800080", "red" =&gt; "#ff0000", "rosybrown" =&gt; "#bc8f8f", "royalblue" =&gt; "#4169e1", "saddlebrown" =&gt; "#8b4513", "salmon" =&gt; "#fa8072", "sandybrown" =&gt; "#f4a460", "seagreen" =&gt; "#2e8b57", "seashell" =&gt; "#fff5ee", "sienna" =&gt; "#a0522d", "silver" =&gt; "#c0c0c0", "skyblue" =&gt; "#87ceeb", "slateblue" =&gt; "#6a5acd", "slategray" =&gt; "#708090", "slategrey" =&gt; "#708090", "snow" =&gt; "#fffafa", "springgreen" =&gt; "#00ff7f", "steelblue" =&gt; "#4682b4", "tan" =&gt; "#d2b48c", "teal" =&gt; "#008080", "thistle" =&gt; "#d8bfd8", "tomato" =&gt; "#ff6347", "turquoise" =&gt; "#40e0d0", "violet" =&gt; "#ee82ee", "wheat" =&gt; "#f5deb3", "white" =&gt; "#ffffff", "whitesmoke" =&gt; "#f5f5f5", "yellow" =&gt; "#ffff00", "yellowgreen" =&gt; "#9acd32" ); $colornames = array_flip($namedcolors); </code></pre>
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