[filmscanners] RE: Scanning negs vs. slides

["michael shaffer" <michael@shaffer.net>]

Anthony writes ...

> ...
> Another analogy is with color spaces.  The Wide Gamut RGB color space can
> cover a huge range of colors, almost as many as the eye can see.  The
> popular sRGB color space, in contrast, can cover only a very limited range
> of colors, roughly comparable to the modest capabilities of things like
> monitors and printed papers.  And yet the sRGB color space looks _nicer_
> when displayed than the Wide Gamut RGB.  Why?  Because sRGB holds all its
> image information within a restricted range that can be accepted by an
> average display device, whereas Wide Gamut RGB spreads this
> information over a huge range, much of which is beyond the
> capability of a typical display
> ...

  Which version pf Photoshop are you using? ... v.5???  I fail to see where
this analogy holds for neg vs pos film(?) ... and in fact send me an sRGB,
which when (properly) converted to "Wide Gamut RGB" or "ProPhoto RGB" will
not appear exactly the same.  The same would be true for going from a wide
gamut of color to smaller, but "looks _nicer_" would be dependent only on
the rendering intent.  On a small gamut device, the colors are the same ...
it is the RGB values which are different.  However, on a large gamut device,
the colors ^will^ be different ... and it will be sRGB values which will
fail your "looks _nicer_" test.

  The question of color gamut aside ... I would have believed your analogy,
in the context of "RGB editability", if you had compared the RGB values akin
to film density, wide gamut space akin to negatives.  That is, (as you say)
you are less likely for posterization for a severe adjustment on a properly
scanned positive versus the same adjustment on a scanned negative.
Similarly, you ^are^ less likely to end up with posterized RGB for the same
adjustment in sRGB, than you are for the same adjustment in Wide Gamut RGB.
Which is why highbit RGB and 16bit tools are always suggested for editing
wide gamut color spaces.

cheerios ... shAf  :o)
Avalon Peninsula, Newfoundland
www.micro-investigations.com (in progress)

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