On Sun, 23 Dec 2001 10:35:42 -0700, newvideo@amug.org (Bill Davis) wrote:

[...]
>But I suspected, even then, that great composers hear the MUSIC in their
>heads first. Then, as they struggle to write it down and communicate it to
>others, all the "rules" are established. Those rules are REFLECTIONS of
>the nature of music.
[...]

Bravo to this and the other parts of your post!
Thanks.

DOF is too complex to describe in simple formulas,
but its effects in the image are easily seen and
judged for effect - and that is where its adjustment
should be made...