<?php
// JPEG 2 ASCII
$in  = 'test.jpg';
$out = 'test.html';
$buf = '';

$gd = imagecreatefromjpeg($in);
$w = imagesx($gd);
$h = imagesy($gd);
for($y=0; $y<$h; $y++){
  for($x=0; $x<$w; $x++){
    $rgb = imagecolorat($gd, $x, $y);
    $r = ($rgb >> 16) & 0xFF;
    $g = ($rgb >>  8) & 0xFF;
    $b = $rgb & 0xFF;
    $buf .= "<span style=\"color:rgb({$r},{$g},{$b});\">#</span>";
    if($w === $x+1){
      $buf .= '<br>';
    }
  }
}
echo "<div style=\"line-height:1px;font-size:1px;\">{$buf}</div>";