etienne,
I just thought about the whole linear/non-linear response of gum and now I think that my method of exposing gum for some time and then flasing it with straigh UL light (no negative) for a short time period (seconds) which results in a very nice extension of highlight detail, is an old-fashined way of curving otherwise linear Stouffer step tablet. Maybe somebody saavy in Potoshop could work out a curve that corresponds to this physical manipulation. It really works miracles to reveal highlight detail of dense negatives. It adds little exposure to shadows that have already been exposed a lot, but changes highliths a lot, since it adds a significant exposure there. Great for those palladium negatives that you never though could be printed in gum.
Marek
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