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Re: filmscanners: What causes this ... projection

Whoops - sorry that was meant to be off-list has Laurie and I have already
bored you all tears with this one.


----- Original Message -----
From: "Steve Greenbank" <steve@gccl.fsbusiness.co.uk>
To: <filmscanners@halftone.co.uk>
Sent: Wednesday, May 16, 2001 12:50 AM
Subject: Re: filmscanners: What causes this ... projection

> Hi Laurie
> Part 2 here - part 3 may take some time as I'm quite busy and it's also
> area where we have the least common ground.
> > >I thought I had covered this with some sort of statement like "even
> > >viewed quite close-up", but I must have rephrased this and removed it
> > before
> > >I posted the message.
> >
> > You did in your original message; but everything is relative.  Some
> > and scenes display the grain more prominently than others as you have
> noted
> > and are obvious even at further distances; while others display grain
> > prominently even at quite close distances.  However, the grain is none
> > less still there in all cases.  You recent test seems to bear not only
> this
> > point out; but the tests from what I can tell given the comparative
> > information you provided  are inconclusive on my point that the screen
> > texture masks the grain structure more so than a smooth surface under
> > same conditions would for the same original.
> >
> I said this in the original reply "I hadn't considered this and nor did I
> fetch my screen when I tried the
> slides tonight. But I can see that how this would work."
> I didn't try the screen test as I would probably of woken my son
> it from his bedroom. I felt that the test onto the paper would also show
> more clearly what the scanner sees.
> Once I had seen the grain on the Velvia slide (I had seen it on the
> Fujichrome 400 years ago) I didn't see a lot of point in trying with the
> screen.
> But my feeling is: a textured surface helps mask the grain as the minor
> spots will have lighter spots reflected from the pits to mask the effect.
> The grain being darker will reflect less so the converse effect will be
> pronounced. This will lead to a reduction in randomly distributed darker
> spots.
> Could be complete bullsh*t, but it seems fairly logical to me and until I
> get the screen out and find out otherwise I am pretty confident that you
> right about the screen.
> Steve


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