In a message dated 1/11/2001 2:16:53 PM EST, [EMAIL PROTECTED] writes:
> > * Combined Image contrast and Image brightness into
> > one option (Color|Image brightness) and improved
> > the color constancy when changing image brightness
>
> Ah, I think I rather wish you hadn't done that Ed, it was fine as it was.
> Isn't this less flexible?
It turns out that using a simple gamma function for contrast wasn't
working very well. If you used it to increase the overall brightness,
the colors looked washed out. The brightness option in previous
versions of VueScan was just a pixel multipler, and this was
basically useless as well, since it just caused the white point to
drop (the White point (%) option is far more useful).
It turns out that the new "Color|Image brightness" option is a
lot subtler than most people realize. Using it to increase or
decrease the overall image brightness is similar to applying
a gamma function (power function) but the colors don't fade
when you use it to increase the brightness. It works quite
well, and it does something that you can't do with curves
in Photoshop.
Regards,
Ed Hamrick
