function XYZ2RGB($xyz)
{
$x = $xyz['X'];
$y = $xyz['Y'];
$z = $xyz['Z'];
if ($x > 1) {
$x = 1;
}
if ($x < 0) {
$x = 0;
}
if ($y > 1) {
$y = 1;
}
if ($y < 0) {
$y = 0;
}
if ($z > 1) {
$z = 1;
}
if ($z < 0) {
$z = 0;
}
if ($y >= 1) {
$r = $g = $b = 1;
} else {
$r = 3.240479 * $x - 1.53715 * $y - 0.498535 * $z;
$g = -0.969256 * $x + 1.875991 * $y + 0.041556 * $z;
$b = 0.055648 * $x - 0.204043 * $y + 1.057311 * $z;
}
$rgb = array();
$linearRGB = array('R' => $r, 'G' => $g, 'B' => $b);
// for ($k=0;$k<count($linearRGB);$k++) {
foreach ($linearRGB as $k => $v) {
// $v=$linearRGB[$i];
if ($v <= 0.0031308) {
$v *= 12.92;
} else {
$v = pow($v, 1 / 2.4) * (1 + 0.055) - 0.055;
}
$v *= 255;
$rgb[$k] = floor($v);
}
$rgb['color'] = RGB2ColorCode($rgb['R'], $rgb['G'], $rgb['B']);
return $rgb;
}
function XYZ2RGB($xyz)
{
list($x, $y, $z) = $xyz;
if ($x > 1) {
$x = 1;
}
if ($x < 0) {
$x = 0;
}
if ($y > 1) {
$y = 1;
}
if ($y < 0) {
$y = 0;
}
if ($z > 1) {
$z = 1;
}
if ($z < 0) {
$z = 0;
}
if ($y >= 1) {
$r = $g = $b = 1;
} else {
$r = 3.240479 * $x - 1.53715 * $y - 0.498535 * $z;
$g = -0.969256 * $x + 1.875991 * $y + 0.041556 * $z;
$b = 0.055648 * $x - 0.204043 * $y + 1.057311 * $z;
}
$rgb = array();
$linearRGB = array($r, $g, $b);
for ($i = 0; $i < count($linearRGB); $i++) {
$c = $linearRGB[$i];
if ($c <= 0.0031308) {
$c *= 12.92;
} else {
$c = pow($c, 1 / 2.4) * (1 + 0.055) - 0.055;
}
$c *= 255;
$rgb[$i] = floor($c);
}
$rgb['color'] = RGB2ColorCode($rgb[0], $rgb[1], $rgb[2]);
return $rgb;
}