Convert Hex to RGB

[johnsmith153]

I need to get the last 2 digits of a hex value and see if they are in the first half or last.

 

Ie RGB 255 - I need to see if the figure (in hex) is less than 128

 

HEX #xxxxFF - yes as no as this 255

 

HEX #xxxx64 - yes as this is 100

 

Does this make sense?

[AV1611]

So,

 

You want to convert the hex AABBCC to decimal XXXYYYZZZ then take the last set and subtract 128 and see if it's a positive number or not?

 

 

http://us2.php.net/hexdec

 

<?php

var_dump(hexdec("See"));

var_dump(hexdec("ee"));

// both print "int(238)"

 

var_dump(hexdec("that")); // print "int(10)"

var_dump(hexdec("a0")); // print "int(160)"

?>

 

[Barand]

$colour = 'C0FFEE';
list ($r, $g, $b) = sscanf($colour, '%02X%02X%02X');
echo $b < 128 ? 'Yes' : 'No';