U can try my little Program i called AlphaStripper. It takes png images (with alpha) and put it into one big image with the ability to adjust or/and center the images.
It is only in german language (sorry for that) but should be intuitiv.
To bad, just in this second my server is down but maybe tomorrow it should work. go on my site: http://www.east-power-soft.de and under SOFTWARE / PROGRAMME u will find ALPHASTRIPPER.
If the server dosn't work, tell it and i can send it per mail directly.
EDIT: Now, the server works again...here the direct link to the site: http://eps.designdevil.de/index.php?show=software/progs/alpha
It is only in german language (sorry for that) but should be intuitiv.
To bad, just in this second my server is down but maybe tomorrow it should work. go on my site: http://www.east-power-soft.de and under SOFTWARE / PROGRAMME u will find ALPHASTRIPPER.
If the server dosn't work, tell it and i can send it per mail directly.
EDIT: Now, the server works again...here the direct link to the site: http://eps.designdevil.de/index.php?show=software/progs/alpha