FURTHER RESULTS OR COMMENTS:-  Once our images are graded in the original format, we are storing the originals on CD and compressing approximately 20 times to JPEG images that are stored with the electronic grading report on our server (for information when the patient is seen in Eye clinic).  Our hospital Intranet, with a bandwidth of 10 megabits, transmits the four images of size 1.2 megabytes in 3.84 seconds (remember an 8 x differential between bit and byte). The office, where most of the image grading takes place, has a 100-megabit line to the server in the computer room. Dr Scanlon is also grading from home using ADSL modem
technology across a private BT copper telephone line and have managed to obtain a bandwidth of 750 kilobits. Each 1.2-megabyte image is taking 17 seconds to transmit.