Transparent text

Add a text watermark to an image.

Transparent text example
("convert $input14 -pointsize 50 -font Arial -fill rgba(0,0,0,0.4) -gravity center -annotate +0+0 \"Rubblewebs\" transparent_text.jpg ");

In this case the text is transparent; the transparency is set with the last value in rgba\(0,0,0,0.4\). If you did not want transparent text you could either use rgb\(0,0,0\) as there is no alpha transparency setting or change rgba\(0,0,0,0.4\) to rgba\(0,0,0,1.0\).
In linux you need to escape the rgba\(0,0,0,0.4\)