Don't forget to remove the profiles from the images. EXIF and IPTC header information can take up as much as 10-25k in a jpeg, especially if it came from a digital camera. I just ran a quick awk script on a recent Lacrosse game that I shot and out of the 122 images, the embedded thumnail file alone averaged 13.2K. These are coming out of a Canon EOS 1D, but the thumbails from other cameras should be similar and probably smaller.