"Helge Gundersen" <helge.gundersen@chello.no> wrote in message
news:helge.gundersen-AF4852.15122317072003@amstwist00.chello.com...
It changes the color balance by increasing the brightness for that channel,
conceptually beyond the previous White point without clipping, and it thus
reduces the relative brightness of the other channels. Look at the histogram
as you change the values, the shape of the curve you are changing is
unchanged, but the other two are compressed as you lower the value.
There is no different VueScan approach to achieve the same effect there, as
far as I can see.
It could be compared with the the Levels command in Photoshop, but there you
have to adjust both the Red and Green Output level White point sliders at
the bottom right, if you want to increase Blue.
Yes, completely. Those influence the shape of the channel curves, most in
the middle, whereas the Neutral control doesn't change the per channel
contrast, only the weighting.
Bart
