wfDebug( __METHOD__ . ": running ImageMagick: $cmd\n" );
wfProfileIn( 'convert' );
$retval = 0;
$err = wfShellExec( $cmd, $retval, $env );
wfProfileOut( 'convert' );
if ( $retval !== 0 ) {
wfDebug( __METHOD__ . ": running ImageMagick: $cmd\n" );
wfProfileIn( 'convert' );
$retval = 0;
$err = wfShellExec( $cmd, $retval, $env );
wfProfileOut( 'convert' );
if ( $retval !== 0 ) {