Transparent text

<?php  
$cmd = " input.jpg -pointsize 50 -font ../verdane.ttf -fill rgba\(0,0,0,0.4\) ".
" -gravity center -annotate +0+0 \"Rubblewebs\" "; 

exec("convert $cmd output.jpg"); 
?>

Add a transparent text watermark to an image. In this case the text is transparent; the transparency is set with the last value in rgba\(0,0,0,0.4\).