[CentOS] SERIOUSLY OT STREAM EDITING IMAGES

Hi All,

I have been Googling my head off but cannot find a method to stream edit 
all the images in a directory and to resize them. I have a large number 
of images of up to 3GB in size that I want to put in albums on a 
website, but before I do this I need to resize them to a more realistic 
configuration.

I know how to do this manually with the GIMP but it becomes tedious for 
more than a few images.

Running CentOS 5 as virtualised under XEN as a web server.

TIA

ChrisG