WHITENING OF JPEGS FOR ECOMMERCE

Hi,

i currently have a member of staff using Gimp to whitening our jpegs for Ecommerce, we have hundreds of images that need doing, these include curtain tiebacks etc...we can do the image get the colour correct but need someone to quickly whiten aroound the edges and background, i no it sounds simple but some of these tiebacks have beads and can take houres, some can be done in a few minutes, we have not got the time to do this, can anyone help, this would be ongoing work to the rightr person, we currently have over 8000 listings on one site already....sorry i should have added, i have no idea the costings for this, would it be buy the hour or for a set of jepgs etc....