<?php

//$img = imagecreatefromjpeg();

$imgw = imagesx($img);
$imgh = imagesy($img);
$ratio = $imgw/$imgh;
$newh = floor(sqrt(800 / $ratio));
$neww = floor($ratio * $newh);

$newimg = imagecreatetruecolor($neww, $newh);
imagecopyresampled($newimg, $img, 0, 0, 0, 0, $neww, $newh, $imgw, $imgh);
imagedestroy($img);

$prev_color = false;
$openned_tag = false;

$max = 0;
$colors = array();

for($j = 0; $j < $newh; $j++) {
  for ($i = 0; $i < $neww; $i++) {
    $color = imagecolorat($newimg, $i, $j);
    $colors[$color] += 1;
    if($max < $colors[$color]) {
        $max = $colors[$color];
        $max_color = $color;
    }
  }
}

$out = '<font size="1"><font color="#'.strtoupper(dechex($max_color)).'"><u>';
for($j = 0; $j < $newh; $j++) {
  for ($i = 0; $i < $neww; $i++) {
    $color = imagecolorat($newimg, $i, $j);
    if($prev_color !== $color) {
        $prev_color = $color;
        if($openned_tag) {
            $out .= '</font>';
            $openned_tag = false;
        }
        if ($color != $max_color) {
            $color = strtoupper(dechex($color));
            $out .= '<font color="#'.$color.'">';
            $openned_tag = true;
        }
    }
    $out .= '███';
  }
  $out .= "\n";
}
if($openned_tag) {
    $out .= '</font>';
    $openned_tag = false;
}
$out .= '</u></font></font>';
echo $out;