Guild Emblems

<?php
// Abyss
$abyss = array(-18, 1, 275, 0.0234375, 1.09375);

// White
$white = array(45, 1.44531, 10, 0.0234375, 1.5625);

// Grape
$grape = array(-3,1,305,0.507813,0.937500);

// Hot Pink
$hotpink = array(14, 1.21094, 340, 0.820313, 1.44531);

// Grapevine
$grapevine = array(2, 1, 270, 0.507813, 1.09375);

header('Content-type: image/png');
$imagebkpath = './backgrounds/1.png';
$image1path = './emblems/2a.png';
$image2path = './emblems/2b.png';
$image_bk = imagecreatefrompng($imagebkpath);
$image_1 = imagecreatefrompng($image1path);
$image_2 = imagecreatefrompng($image2path);
$background = imagecolorallocate($image_bk,  0,0,0);
imagecolortransparent($image_bk, $background);
imagealphablending($image_bk, true);
imagesavealpha($image_bk, true);
imagehue($image_bk, $abyss[0],$abyss[1],$abyss[2],$abyss[3],$abyss[4]);
imagehue($image_1, $white[0],$white[1],$white[2],$white[3],$white[4]);
imagehue($image_2, $grape[0],$grape[1],$grape[2],$grape[3],$grape[4]);
imagecopy($image_1, $image_2, 0, 0, 0, 0, 256, 256);
imagecopy($image_bk, $image_1, 0, 0, 0, 0, 256, 256);
imagepng($image_bk);
imagedestroy($image_bk);
imagedestroy($image_1);
imagedestroy($image_2);

function imagehue(&$image, $b,$c,$h,$s,$l) {
    $width = imagesx($image);
    $height = imagesy($image);
    for($x = 0; $x < $width; $x++) {
        for($y = 0; $y < $height; $y++) {
            $rgb = imagecolorat($image, $x, $y);
            $r = ($rgb >> 16) & 0xFF;
            $g = ($rgb >> 8) & 0xFF;
            $b = $rgb & 0xFF;
            $alpha = ($rgb & 0x7F000000) >> 24;
            $rgb = array(128,26,26);
            $rgb = shiftColour($rgb,$b,$c,$h,$s,$l);
            imagesetpixel($image, $x, $y, imagecolorallocatealpha($image, $rgb[0], $rgb[1], $rgb[2], $alpha));
        }
    }
}

// shiftColour from https://gist.github.com/codemasher/fb407de5587fdbd3e7c5
function shiftColour($rgb,$b,$c,$h,$s,$l){
    $rgb = rgb_BC($rgb,$b,$c);
    $hsl = rgb2hsl($rgb);
    $hsl[0] = ($hsl[0]*360+$h)/360;
    $hsl[1] = $hsl[1] * $s;
    $hsl[2] = $hsl[2] * $l;
    $rgb = hsl2rgb($hsl);
    return $rgb;
}

// rgb_BC from code here: https://gist.github.com/codemasher/fb407de5587fdbd3e7c5
function rgb_BC($rgb,$b,$c){
    foreach($rgb as $k => $v){
        $rgb[$k] = (($v+$b)-128) * $c+128;
    }
    return $rgb;
}

//rgb2hsl from code here: https://gist.github.com/codemasher/741f30e68c6e9c7921c7
function rgb2hsl($rgb){
    $r = $rgb[0]/255;
    $g = $rgb[1]/255;
    $b = $rgb[2]/255;

    $min = min($r, $g, $b);
    $max = max($r, $g, $b);
    $d = $max-$min;

    $h = $s = 0;
    $l = ($max+$min)/2;

    if($d > 0){
        $s = $l > 0.5 ? $d/(2-$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 array($h, $s, $l);
}

// hsl2rgb from code here: https://gist.github.com/codemasher/741f30e68c6e9c7921c7
function hsl2rgb($hsl){
    $h = $hsl[0];
    $s = $hsl[1];
    $l = $hsl[2];

    $r = $g = $b = $l;
    if($s <> 0){
        $q = $l < 0.5 ? $l*(1+$s) : $l+$s-$l*$s;
        $p = 2*$l-$q;
        $r = hue2rgb($p, $q, $h+1/3);
        $g = hue2rgb($p, $q, $h);
        $b = hue2rgb($p, $q, $h-1/3);
    }

    return array($r*255, $g*255, $b*255);
}

// hue2rgb from code here: https://gist.github.com/codemasher/741f30e68c6e9c7921c7
function hue2rgb($p, $q, $t){
    if($t < 0) $t += 1;
    if($t > 1) $t -= 1;
    if($t < 1/6) return $p+($q-$p)*6*$t;
    if($t < 1/2) return $q;
    if($t < 2/3) return $p+($q-$p)*(2/3-$t)*6;
    return $p;
}
?>