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colorPalette Function returns all colors in an image

/ Published in: PHP
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This gives you an array whose values are higher for how often that color has been used.

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  1. <?php 
  2. function colorPalette($imageFile, $numColors, $granularity = 5) 
  3. { 
  4.    $granularity = max(1, abs((int)$granularity)); 
  5.    $colors = array(); 
  6.    $size = @getimagesize($imageFile); 
  7.    if($size === false) 
  8.    { 
  9.       user_error("Unable to get image size data"); 
  10.       return false; 
  11.    } 
  12.    $img = @imagecreatefromjpeg($imageFile); 
  13.    if(!$img) 
  14.    { 
  15.       user_error("Unable to open image file"); 
  16.       return false; 
  17.    } 
  18.    for($x = 0; $x < $size[0]; $x += $granularity) 
  19.    { 
  20.       for($y = 0; $y < $size[1]; $y += $granularity) 
  21.       { 
  22.          $thisColor = imagecolorat($img, $x, $y); 
  23.          $rgb = imagecolorsforindex($img, $thisColor); 
  24.          $red = round(round(($rgb['red'] / 0x33)) * 0x33); 
  25.          $green = round(round(($rgb['green'] / 0x33)) * 0x33); 
  26.          $blue = round(round(($rgb['blue'] / 0x33)) * 0x33); 
  27.          $thisRGB = sprintf('%02X%02X%02X', $red, $green, $blue); 
  28.          if(array_key_exists($thisRGB, $colors)) 
  29.          { 
  30.             $colors[$thisRGB]++; 
  31.          } 
  32.          else 
  33.          { 
  34.             $colors[$thisRGB] = 1; 
  35.          } 
  36.       } 
  37.    } 
  38.    arsort($colors); 
  39.    return array_slice(array_keys($colors), 0, $numColors); 
  40. } 
  41. // sample usage: 
  42. $palette = colorPalette('rmnp8.jpg', 10, 4); 
  43. echo "<table>\n"; 
  44. foreach($palette as $color) 
  45. { 
  46.    echo "<tr><td style='background-color:#$color;width:2em;'>&nbsp;</td><td>#$color</td></tr>\n"; 
  47. } 
  48. echo "</table>\n";
  49.  
  50. ?>

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