Create a new image from a given part of GD2 file or URL in PHP

<?php//from w  ww.j a v a2 s . c om
// For this example we need the image size before
$image = getimagesize('./test.gd2');

// Create the image instance now we got the image
// sizes
$im = imagecreatefromgd2part('./test.gd2', 4, 4, ($image[0] / 2) - 6, ($image[1] / 2) - 6);

// Do an image operation, in this case we emboss the
// image if PHP 5+
if(function_exists('imagefilter'))
{
    imagefilter($im, IMG_FILTER_EMBOSS);
}

// Save optimized image
imagegd2($im, './test_emboss.gd2');
imagedestroy($im);
?>