gistfile1.php

<?php

// here is my previous code, i open and save directly the original size and there was a transparency issue.

$imagine = new Imagine\Gd\Imagine();
$image = $imagine->open($file->getTempName())
                ->save('path'), array('quality' => 95));


// with this, no more issue, because resize use the imagealphablending function

$imagine = new Imagine\Gd\Imagine();
list($w, $h)  = getimagesize($file->getTempName());
$image = $imagine->open($file->getTempName())
                ->resize(new Box($w, $h))
                ->save('path'), array('quality' => 95));

// I think it's a bug, because if i want to save the original size without "working" on the image, i also want to    keep the transparency :)