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shift() - get a darker/lighter shade of a #hex color. Needs cutoff() and both hex functions to run.
function shift($hexcode="#ffffff",$proc=0.3) {    $rgb = hex_to_rgb($hexcode);         //color shift    $rgb['r'] = cutoff($rgb['r'] + $proc,0,1);    $rgb['g'] = cutoff($rgb['g'] + $proc,0,1);    $rgb['b'] = cutoff($rgb['b'] + $proc,0,1);          return rgb_to_hex($rgb); //result color }
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is_dark() - says if color is dark or light, so you can use white or black type over it. Obviously, not so good with the edge cases, but better than nothing. Needs hex_to_rgb().
function is_dark($hexcode="#ffffff") { Â Â Â $rgb = hex_to_rgb($hexcode); Â Â Â $luminance = ($rgb['r']*0.299 + $rgb['g']*0.587 + $rgb['b']*0.114); Â Â Â if ($luminance > 0.5) { Â Â Â Â Â Â Â return false; Â Â Â } else { Â Â Â Â Â Â Â return true; Â Â Â } }
hex_to_rgb() and rgb_to_hex() - self-explanatory I hope.
function hex_to_rgb($hexcode="#ffffff") {    $hexcode = str_replace("#", "", $hexcode);       //separate hexcode    $redhex = substr($hexcode,0,2);    $greenhex = substr($hexcode,2,2);    $bluehex = substr($hexcode,4,2);       //to rgb 0..1    $r = (hexdec($redhex)) / 255;    $g = (hexdec($greenhex)) / 255;    $b = (hexdec($bluehex)) / 255;       return array(        'r' => $r,        'g' => $g,        'b'   => $b,    ); } function rgb_to_hex($rgb=array(1,1,1)) {           //to hex parts    $redhex = dechex($rgb['r'] * 255);    $greenhex = dechex($rgb['g'] * 255);    $bluehex = dechex($rgb['b'] * 255);       //combine into hex string    $hexcode = sprintf("#%1$02s%2$02s%3$02s", $redhex, $greenhex, $bluehex);    return $hexcode; }
the dumbest of them all - cutoff(), basically a riff on Arduino's constrain()
function cutoff($num,$low,$high) { Â Â Â $val = max(array($num,$low));Â Â Â Â Â Â Â Â Â Â $val = min(array($val,$high)); Â Â Â return $val; }
I've been working on PHP color manipulation, so I'll post a bunch of functions I wrote for it. (It's reinventing the wheel, probably, but how else you're supposed to learn, right?) The tag is "PHP color manipulation".
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