W
Wilfred
Don said:This one:
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Even though Bart agonizes trying to minimize the problems by using
vague and circumspect language, the truth still comes through if one
reads carefully.
No, you are arguing that VueScan offers an incorrect interpretation of
the 'curves' concept, not that it *handles* the corrections incorrectly
(i.e., that it would make miscalculations based on the values the user
has entered at 25% and 75% or that it wouldn't be WYSIWYG).
IMO what VueScan offers is a very limited subset of what you can do with
curves. For some, that's better than nothing.
It's certainly no proof positive in the absolute sense, but you can't
just casually dismiss a known and appalling track record based on
reliable sources.
My own VueScan usage has not produced an 'appalling track record'. For
myself, I am a reliable source. The program has had is glitches and
quirks, but hey, hasn't all software?
Sure, you can give an unknown product such a benefit of the doubt, but
after a product repeatedly demonstrates its unreliability it would be
irrational to ignore its track record.
To me, VueScan is not an unknown product. To you, it still is - at least
true where recent versions are concerned.
The important thing is that this Vuescan contraption is anything by
"Curves". In addition to all the "oddities" Bart has outlined, having
only two fixed points and working totally blind makes it basically
useless.
I think you're right about the intention because the "S" curve is
really a contrast adjustment.
That's a stretch (because it addresses a very narrow subset) and I'm
sure the author did not even consider that.
Instead he wanted to be able to (falsely!) advertise Vuescan as having
Curves.
He doesn't seem to. This is what he says on his website: 'Added
"Prefs|Graph type" for curves'. This is a rather cryptic remark and I
still don't know what it means. It's not good marketing, that's for sure;-)
The Vuescan "curves" contraption has nothing to do with standards. The
standards I refer to above are things like using EV for exposure.
I don't know any scanning software that uses EV for exposure. But I have
no experience with NikonScan or SilverFast. Do they have EV adjustment?
I can imagine that it would be an advantage indeed.