Brian wrote:
What is the best compression (1 - 100%) to use when saving a scanned
colour photo in jpeg?
I was to be able to display the photo on the computer screen and also
be able to print the saved photo on a inkjet printer.

If I have very little compression then the saved photo file size is
too big in size. Is there a general rule I can use to decide the best
compression to use?

You need to determine this for yourself - what is acceptable to one person
may not be to another. Printing is likely to require a higher quality of
image than display on the computer screen (as the screen is limited to
about 1MP and your scan is likely to be more than that). You also need to
be sure that you are scanning to a sufficient number of pixels per inch.

David