On Tuesday, September 11, 2001 at 13:55, C.H.Ling <olympus@xxxxxxxxxxxxxxx>
wrote on "Re: [OM] The E-10 -- what about it?," saying..
> Your word of "same lighting situation" is very tricky, you can never
> do that unless in studio. Any background change will affect the
> autoexposure function of the scanner, even the clothes color will
> affect your result.
But there are many common situations where you can duplicate the
lighting very well. Flash. Daylight. Night games. A room. Yes, there
are small variations, but not major ones.
Using a colour chart which will picture the gamma, contrast, and
brightness of each colour will allow you to capture any lighting
situation. e.g.
http://www.dgcolour.co.uk/Specialist%20Colour%20Charts.htm#Checker
So even if the scanner changes things, you can still bring the test
photo back to where it should be, and using the same settings, bring
the other photos.back too.
> The biggest problem is it not only affect the brightness and
> contrast, the RGB will be shifted and you can never get it back to
> the exact value. I have not found any software that can handle the
> negative well (I mean provide you accurate color and contrast) even
> for the highly praised Vuescan. If you know how the scanner
> software work you will know under most situation the software
> cannot render the actual color, for the best they just provide you
> something that look good.
I think duplicating colour perfectly is very difficult. Inks,
pigments, dyes, and our eye's cones are different.
The spectrum is continuous, but our eyes see 3 colours, basically,
and can even see those three when seeing white + red! See
http://members.nbci.com/altphotoprc/alt98b/0694.html
http://www.rowland.org/land/ - look for Maxwell
> If you don't believe you can take two shot at the same time, one with
> slide and the other with negative. Process them, take the neagtive to
> scan and try to see how your software peform.
It's not automatic. But manually, you can adjust for common effects,
in this case, the effects of light, lens, film, and development by
determining the right adjustment to get things to a common standard,
or "normal", then applying it.
It's called normalisation. Not perfect, but not guesswork.
Of course, this assumes full-spectrum lighting. Fluorescents and
other gas discharge lamps are far more awkward, as they leave holes
in the spectrum.
Tom
> You may also argue even many slides are not designed to render actual
> color like the E100VS, so I just stick with Sensia II and Provia F for
> their more "close to real" color.
>
> C.H.Ling
>
> "Tom A. Trottier" wrote:
> >
> > You can if the first exposure on each roll is a colour chart in the
> > same lighting situation.
> >
> > Tom
> >
> > On Tuesday, September 11, 2001 at 12:09, C.H.Ling <olympus@xxxxxxxxxxxxxxx>
> > wrote on "Re: [OM] The E-10 -- what about it?," saying..
> >
> > > I mainly use slides you can compare the scan and original very easily,
> > > it is also more true to life. For negative, you never know what is the
> > > original color although you can adjust for what you like.
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