0.5 ? $d / (2.0 - $max - $min) : $d / ($max + $min);
switch ($max) {
case $r: $h = ($g - $b) / $d + ($g < $b ? 6 : 0); break;
case $g: $h = ($b - $r) / $d + 2; break;
case $b: $h = ($r - $g) / $d + 4; break;
}
$h /= 6;
}
return [round($h * 360), round($s * 100), round($l * 100)];
}
$result = '';
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$hex_input = trim($_POST['hex_input'] ?? '');
$rgb = hexToRgb($hex_input);
if ($rgb) {
[$r, $g, $b] = $rgb;
[$h, $s, $l] = rgbToHsl($r, $g, $b);
$hex_clean = sprintf("#%02x%02x%02x", $r, $g, $b);
$result = "HEX: $hex_clean\nRGB: $r, $g, $b\nHSL: $h°, $s%, $l%";
} else {
$result = "Ungültiger HEX-Wert.";
}
}
?>