[filmscanners] RE: the histogram in Nikonscan

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

The sliders on the left at the top and bottom of the Y axis, are the Output
white and black point.

It sounds to me like you are raising the output black point, which would
indeed make the shadows of your picture lighter.

In Photoshop you will find a similar facility on the curves dialog, but it
isn't obvious (without those nice arrows) what you're doing.  On the Levels
dialog you will see two text boxes for the output black and white points,
which normally contain 0 and 255.

As to why you might edit a picture, I'm afraid to say there's no substitute
for a lot of reading and experimentation.  Six months is the normal learning
curve, I reckon, to achieve competence.  Margulis's Professional Photoshop
is useful.

Nikon scan makes things interesting because it provides you with the option
to edit directly in the Luminosity channel.  Nice...

Jawed

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk 
> [mailto:filmscanners_owner@halftone.co.uk] On Behalf Of Ed Verkaik
> Sent: 19 January 2004 19:36
> To: Jawed@cupidity.force9.co.uk
> Subject: [filmscanners] Re: the histogram in Nikonscan
> 
> 
> I sent in a post about using Nikonscan last week (part copied 
> below) with no
> responses.  Can someone please enlighten me as to the 
> usefulness of the two
> sliders on the left side of the curves window?  For what 
> kinds of situations or
> problems would you resort to using them?
> 
> Also, anyone know a web resource that looks at these 
> adjustments in a practical
> way, describing when to use them and what the risks are? All 
> the articles I've
> read are too technical and rarely touch on "why" "why not" or 
> "when" to apply
> the various histogram functions.
> 
> Thanks.
> Ed Verkaik
> 
> --------------------------------------------------------------
> ------------------
> --------
> Today I was playing around in the Nikonscan Curves histogram 
> and toyed with the
> two sliders on the left side. I noticed that on a photo with 
> bright sky and dark
> ground, you can move the lower slider up to add light to the 
> ground, more
> effectively than bending the curve.  But I do not know what 
> those two sliders do
> or should be used for.  Can anyone explain in non-technical 
> terms what effect
> (practical examples) using either of those sliders has and 
> when they should be
> used over any other methods? Are there risks?  (Please don't 
> tell me to go
> master PS... I like using Nikonscan for this.  :-) )
> --------------------------------------------------------------
> ------------------
> --------
> 
> 
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