I am challenging again with ImageMagick.
I am trying with following command put text on image (in center location) and later move it -left and right. Documentation says, that gravity can be using in concert with geometry - but it seems not working as I expected. I am trying this command:
convert render/pre.button.png -gravity south -geometry +30+30 -annotate 0 'Faerie Dragon' render/button.png
Unfortunately geometry does not work with gravity, for me :(