function isSupportConversion($file, $src_type = '', $dest_type = '')
{
if (!$src_type) {
$imginfo = @getimagesize($file);
if (!$imginfo) {
throw new lmbFileNotFoundException($file);
}
$src_type = lmbGdImageContainer::convertImageType($imginfo[2]);
}
if (!$dest_type) {
$dest_type = $src_type;
}
return lmbGdImageContainer::supportLoadType($src_type) && lmbGdImageContainer::supportSaveType($dest_type);
}