[filmscanners] RE: Blackpoint & noise, was grain

["Alessandro Pardi" <alessandro.pardi@inferentiadnm.com>]

Yes, now I see it (saved the jpegs and cranked magnification up to 400% in
PS).
And, sorry, but I have no idea of where it may come from... The obvious
solution is to scan with bp=0% and modify the image later in PS with levels
or curves (which also gives you more flexibility), but I understand that
this is no answer to your question.
BTW, what Vuescan version are you using?

Alex

> -----Original Message-----
> From: Mark T. [mailto:markthomasz@ozemail.com.au]
> Sent: venerdì 15 febbraio 2002 13.27
> To: alessandro.pardi@inferentiadnm.com
> Subject: [filmscanners] RE: Blackpoint & noise, was grain
> 
> 
> Alessandro wrote:
> >if these are different hardware scans (and not different 
> scans - from disk
> 
> Yes they are two different scans.
> 
> >..the fact that the "noise" has exactly the same
> >pattern in both pictures indicates that it is *not* noise 
> (which is random)
> 
> I don't think we are referring to the same thing.  There is 
> no real noise in the left scan, it's just shadow detail..
> 
> The noise I mean is *very* fine, scattered dark specks, 
> mostly of about 2-4 pixels in size, that *only* appears in 
> the right hand image.  Try winding your monitors brightness 
> or gamma way up, and then looking very closely at the swan's 
> back.  Eg, 6" from your monitor.
> 
> >and it is more visible in the picture with bp=1% simply 
> because that picture
> >is a bit brighter (or, at least, it appears brighter on my monitor).
> 
> Yes, I did wind the right hand one up a little bit too far, 
> but that was to help show up these specks.  If your monitor 
> is not adjusted quite brightly, they may not be visible at 
> all.  If you save the images, and then wind them *way* up, I 
> think you will see what I mean.
> 
> Sadly I am in the midst of shifting house, and have not yet 
> set up the scanner so it will be a while before I can do any 
> further tests.
> 
> mt
> 
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