Nejvíce používaná základní barva v obrázku

<?php
/*(C) 2011 EtexWEB API Development
 * Richard Dobroň
 * Color Palette v1.2
*/

function FarbyObrazku($max, $img) {
   $img = imagecreatefromjpeg($img);
  
   $w = imagesx($img);
   $h = imagesy($img);
	$pocet = 0;
  
   for($y=0;$y<$h;$y++) {
      for($x=0;$x<$w;$x++) {
         $rgb = imagecolorat($img, $x, $y);
         $r = ($rgb >> 16) & 0xFF;
         $g = ($rgb >> 8) & 0xFF;
         $b = $rgb & 0xFF;        
         $arr[] =  "#".str_repeat("0",2-strlen(dechex($r))).dechex($r).str_repeat("0",2-strlen(dechex($g))).dechex($g).str_repeat("0",2-strlen(dechex($b))).dechex($b);
	$pocet++;
      }
   }

function cmp($a, $b) {
    if ($a == $b) {
        return 0;
    }
    return ($a > $b) ? -1 : 1;
}


$aa = array_count_values($arr);
uasort($aa,'cmp');$n=0;
foreach($aa as $cc) {
if($n <=$max) {
    $xx = array_keys($aa);
echo "<div style=\"display:inline-block;height: 26px;width: 26px;border:1px solid #000000;margin-left:1px;background: ".$xx[$n]."\"></div>"; //title=\"".Round(substr($pocet,0, 3)/100*substr($cc,0, 2))." %\"

}
$n++;
}
}
echo FarbyObrazku(8, "go_image_r_13465_1000_800.jpg");

<?php
function colorPalette($imageFile, $numColors, $granularity = 5)
{
   $granularity = max(1, abs((int)$granularity));
   $colors = array();
   $size = @getimagesize($imageFile);
   if($size === false)
   {
      user_error("Unable to get image size data");
      return false;
   }
   $img = @imagecreatefromjpeg($imageFile);
   if(!$img)
   {
      user_error("Unable to open image file");
      return false;
   }
   for($x = 0; $x < $size[0]; $x += $granularity)
   {
      for($y = 0; $y < $size[1]; $y += $granularity)
      {
         $thisColor = imagecolorat($img, $x, $y);
         $rgb = imagecolorsforindex($img, $thisColor);
         $red = round(round(($rgb['red'] / 0x33)) * 0x33);
         $green = round(round(($rgb['green'] / 0x33)) * 0x33);
         $blue = round(round(($rgb['blue'] / 0x33)) * 0x33);
         $thisRGB = sprintf('%02X%02X%02X', $red, $green, $blue);
         if(array_key_exists($thisRGB, $colors))
         {
            $colors[$thisRGB]++;
         }
         else
         {
            $colors[$thisRGB] = 1;
         }
      }
   }
   arsort($colors);
   return array_slice(array_keys($colors), 0, $numColors);
}
// sample usage:
$palette = colorPalette('rmnp8.jpg', 10, 4);
echo "<table>\n";
foreach($palette as $color)
{
   echo "<tr><td style='background-color:#$color;width:2em;'>&nbsp;</td><td>#$color</td></tr>\n";
}
echo "</table>\n";

<select name="tonalita">
<option value="cervena">červená</option>
<option value="zelena">zelená</option>
<option value="modra">modrá</option>
<option value="zluta">žlutá</option>
atd...
</select>