Build a colorProfile from an image with Imagick

colorReduce.php

/**
* Generate a Color Palette
* Using Imagick to quantize the image
* (http://www.php.net/manual/en/class.imagick.php)
*
* ASSUMPTION - your image directory has suitable permission levels to allow
*              your script to edit/copy/create files.
**/


// How many colors will we reduce the image to?
define('NUM_COLORS',16);

// define pathways
define('IMG_DIR', path_to_img_dir_on_your_system) ;

// Uses Imagick - so make sure it exists
if (class_exists('Imagick')) {

  // Make a temporary copy of the image
  exec('cp ' . IMG_DIR . '/'. $sImage.' ' . IMG_DIR  .'/TEMP-'.$sImage );

  // First reduce the colors by quantizing the temporary image
  $oImagick = new Imagick(IMG_DIR  .'/TEMP-'.$sImage );

  $colorSpace   = 1;
  $treeDepth    = 0;
  $dither       = 0;
  $measureError = 0;
  $oImagick->quantizeImage(NUM_COLORS, $colorSpace,$treeDepth,$dither,$measureError);

  // Now we have reduced the image to NUM_COLORS - what are those colors ?
  $nColors = $oImagick->getImageColors();

  
  for ($i=0;$i<$nColors;$i++) {
           
    $oImPixel = $oImagick->getImageColormapColor($i);
    $aColor = $oImPixel->getColor();

    // Convert to RGB hex values
    // --------------------------
    $r = str_pad(dechex($aColor['r']),2,0,STR_PAD_LEFT);
    $g = str_pad(dechex($aColor['g']),2,0,STR_PAD_LEFT);
    $b = str_pad(dechex($aColor['b']),2,0,STR_PAD_LEFT);

    // Create a little block of this color
    // -------------------------------------
    // echo 'dec to hex - '.$r.$g.$b;
    // echo '<div style="width:50px; height:22px;background-color:#'.$r.$g.$b.';">&nbsp; </div>';

    // echo 'RGB %';
    // echo '<div style="width:50px; height:22px;background-color:'.$oImPixel->getColorAsString().'">&nbsp; </div>';
    // echo '<br /> - - - - - - '.$oImPixel->getColorAsString();

  } // end for each color

  // Delete the temporary image
  exec('rm '. IMG_DIR  .'/TEMP-'.$sImage );


} // end If imagick exists