<?php
function xmp_print($arr) { echo '<xmp>'; print_r($arr); echo '</xmp>'; }
function rgb2xyz($rgb){
list($r, $g, $b) = $rgb;
$r = $r > 0.0001586274509803922 ? pow( $r/269.025 + 0.0521327014218009, 2.4)*100 : $r/32.946;
$g = $g > 0.0001586274509803922 ? pow( $g/269.025 + 0.0521327014218009, 2.4)*100 : $g/32.946;
$b = $b > 0.0001586274509803922 ? pow( $b/269.025 + 0.0521327014218009, 2.4)*100 : $b/32.946;
// Observer = 2°, Illuminant = D65
$x = $r*0.4124 + $g*0.3576 + $b*0.1805;
$y = $r*0.2126 + $g*0.7152 + $b*0.0722;
$z = $r*0.0193 + $g*0.1192 + $b*0.9505;
return array($x, $y, $z);
}
$white = array(255,255,255);
$yellow = array(255,255,0);
$red = array(255,0,0);
$black = array(0,0,0);
xmp_print( rgb2xyz( $white ) );
xmp_print( rgb2xyz( $yellow ) );
xmp_print( rgb2xyz( $red ) );
xmp_print( rgb2xyz( $black ) );
Array
(
[0] => 95.05
[1] => 100
[2] => 108.9
)
Array
(
[0] => 77
[1] => 92.78
[2] => 13.85
)
Array
(
[0] => 41.24
[1] => 21.26
[2] => 1.93
)
Array
(
[0] => 0
[1] => 0
[2] => 0
)
