image resizing

I want to write an thumbnailing program where by you select a directory of large images and the program will create thumbnails and HTML output ready for the web.

I have been looking at the Cimg library for image resizing, am I going in the right direction here or can someone recomend something else?

Thanks

Just stumbled accross ImageMagick. Does anyony know anything about this

http://www.imagemagick.org/www/Magick++/index.html

bttt ........