Looking for batch-mode software for left and right trimming 100 images

view full story

http://crunchbanglinux.org – This is a one time project so I am only looking for freeware or non-crippled shareware.I have over 100 screenshot BMP images.  Each is 1280 pixels wide.  I want to trim 267 pixels off the left side of each and 63 pixels off the right side.  The resulting images would be 950 pixels wide.This would be a tedious process manually but should be simple with the right image software (command line or graphical, Linux or Windows).Any graphics folks out there who can point me to a good solution? (HowTos)