Book Convert

conv.php

#!/usr/bin/php
<?php

$start = $argv[1];
$stop  = $argv[2];
for($i=$start; $i<=$stop; $i++){
  $exe = "convert $i.png -rotate 270 $i.png";
  echo "$exe\n";
  `$exe`;
  // Left page
  $exe = "convert $i.png -crop 1577x2294+87+127 $i\_a.png";
  echo "$exe\n";
  `$exe`;
  $exe = "convert $i\_a.png -resize 825x1200 $i\_a.png";
  echo "$exe\n";
  `$exe`;
  // Right page
  $exe = "convert $i.png -crop 1577x2294+1841+127 $i\_b.png";
  echo "$exe\n";
  `$exe`;
  $exe = "convert $i\_b.png -resize 825x1200 $i\_b.png";
  echo "$exe\n";
  `$exe`;
  // Clean up
  $exe = "rm $i.png";
  echo "$exe\n";
  `$exe`;
}

fork.php

#!/usr/bin/php
<?php

$count = count(glob("*.png"));

$threads = $argv[1];
$script = "#!/bin/sh\n";
for($i = 1; $i<=$threads; $i++){
  $start = round($count/$threads*($i-1))+1;
  $stop  = round($count/$threads*($i));
  $script .= "./conv.php $start $stop &\n";
}
echo $script;