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<?php function convertRGBToXY($red, $green, $blue) { // Normalize the values to 1 $normalizedToOne['red'] = $red / 255; $normalizedToOne['green'] = $green / 255; $normalizedToOne['blue'] = $blue / 255; // Make colors more vivid foreach ($normalizedToOne as $key => $normalized) { if ($normalized > 0.04045) { $color[$key] = pow(($normalized + 0.055) / (1.0 + 0.055), 2.4); } else { $color[$key] = $normalized / 12.92; } } // Convert to XYZ using the Wide RGB D65 formula $xyz['x'] = $color['red'] * 0.664511 + $color['green'] * 0.154324 + $color['blue'] * 0.162028; $xyz['y'] = $color['red'] * 0.283881 + $color['green'] * 0.668433 + $color['blue'] * 0.047685; $xyz['z'] = $color['red'] * 0.000000 + $color['green'] * 0.072310 + $color['blue'] * 0.986039; // Calculate the x/y values if (array_sum($xyz) == 0) { $x = 0; $y = 0; } else { $x = $xyz['x'] / array_sum($xyz); $y = $xyz['y'] / array_sum($xyz); } return array( 'x' => $x, 'y' => $y, 'bri' => round($xyz['y'] * 255) ); } function convertXYToRGB($x, $y, $bri = 255) { // Calculate XYZ $z = 1.0 - $x - $y; $xyz['y'] = $bri / 255; $xyz['x'] = ($xyz['y'] / $y) * $x; $xyz['z'] = ($xyz['y'] / $y) * $z; // Convert to RGB using Wide RGB D65 conversion $color['red'] = $xyz['x'] * 1.656492 - $xyz['y'] * 0.354851 - $xyz['z'] * 0.255038; $color['green'] = -$xyz['x'] * 0.707196 + $xyz['y'] * 1.655397 + $xyz['z'] * 0.036152; $color['blue'] = $xyz['x'] * 0.051713 - $xyz['y'] * 0.121364 + $xyz['z'] * 1.011530; foreach ($color as $key => $normalized) { // Apply reverse gamma correction if ($normalized <= 0.0031308) { $color[$key] = 12.92 * $normalized; } else { $color[$key] = (1.0 + 0.055) * pow($normalized, 1.0 / 2.4) - 0.055; } // Scale back from a maximum of 1 to a maximum of 255 $color[$key] = round($color[$key] * 255); } return $color; } print_r($rgb = convertRGBToXY(0, 0, 255)); print_r(convertXYToRGB($rgb['x'], $rgb['y'], 255));