RE: filmscanners: VueScan 7.3.2 Available

["Jawed Ashraf" <Jawed@cupidity.force9.co.uk>]

It is worth bearing in mind that percentages give you more fine-grained
control than numbers typed into a Levels box.  A Level number is an 8-bit
thing (from 0 to 255) - well, by convention it is, anyway.

BUT, if you turn off the Auto black/white point option, you get to change
the black/white point for R, G and B seperately.  With numbers that are more
fine-grained than the 0-255 scale.

I have to say that if one is interested in doing significant changes to
R-G-B-combined Levels (e.g. 20 points plus in Photoshop speak - not percent)
or gamma changes in excess of about 1.2/0.8-ish then one should think about
doing these in LAB mode to avoid causing significant saturation changes.
Which means that Vuescan may not be the place to do these kinds of
manipulations.

Maybe Ed has programmed Vuescan to avoid saturation-type changes when using
black-point and white-point percentages.

Jawed

> -----Original Message-----
> From: owner-filmscanners@halftone.co.uk
> [mailto:owner-filmscanners@halftone.co.uk]On Behalf Of sirius
> Sent: 14 December 2001 00:40
> To: filmscanners@halftone.co.uk
> Subject: Re: filmscanners: VueScan 7.3.2 Available
>
>
> salut
>
> A histogram should have enough resolution to make precise settings
> possible....i would prefer to set the points numerically, but with visual
> feedback, a densitometer-like tool would be the important companion. It
> should be available like an option. Best for me would be a double
> histogram:
> one representing the raw scan data and a second representing the
> result when
> applying gamma, wp and bp.
> I suppose it is a lot of work to create these tools for Ed Hamrick, but it
> seems there is a lot of public for these features.
> I must say that in most cases it works now alright for me, but in some
> critical images i would really like better/precize control over BP, WP and
> gamma curve. my main issue is that it works now with percentages
> instead of
> exact numbers....
>
> regards
> jan albrecht
> ----- Original Message -----
> From: "sirius" <sirius1@wanadoo.nl>
> To: <filmscanners@halftone.co.uk>
> Sent: Thursday, December 13, 2001 5:28 AM
> Subject: Re: filmscanners: VueScan 7.3.2 Available
>
>
> > salut Ed,
> > one question:
> > > What's new in version 7.3.2
> > >
> > >   * Added support for RGB exposure on some Epson scanners
> > also on the epson expression 1600 pro?
> >
> > And I am very HAPPY with the again separated preview and scan window!!!!
> >
> > (suggestion: can they be made detachable so you can drag them to another
> > monitor?
> > Also i am still wishing some  better control of white and BP: a
> histogram?
> > Please! Please?)
> >
> > thanks a lot
> >
> > jan albrecht
> >
> >
>
>