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Filmscanners mailing list archive (filmscanners@halftone.co.uk)

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RE: filmscanners: Grain, Noise, et al



Hi, Norman--

Sounds to  me like your "blue pictures" might have taken a small beating in 
the processing stage.

Yes, there is a specific technique in PS6 to recombine RGB after you've 
blurred the blue chanel, but I do it so infrequently (I don't have a working 
PS6 of my own, I use Corel), that I'm not really qualified to "walk you 
through."  I do it with a manual in my lap. :-)

Hopefully one of the better PS users here can help you better.

Best regards--LRA


>
>Lynn,
>
>Yeah, I must not have that technique down. I can blur the blue channel OK
>but when I go back to the 'RGB' view, I don't see much, if any change. Is
>there a specific technique to use in PS 6 to do this? I've got some 
>pictures
>of the Grand Canyon, shot during overcast and stormy conditions - talk 
>about
>a lot of blue and, consequently, a lot of grain. The Canyon under these
>conditions had a blue cast throughout. Decent shots but lots of grain after
>scanning.
>
>Norm Unsworth, Owner
>CS Golf (formerly Clark Systems Custom Golf)
>Outstanding Quality and Value in Custom Golf Equipment
>609 641 5712
>Please send email to me at: csgolf@home.com
>Visit our Web Site at http://members.home.net/csgolf
>
> > -----Original Message-----
> > From: owner-filmscanners@halftone.co.uk
> > [mailto:owner-filmscanners@halftone.co.uk]On Behalf Of Lynn Allen
> > Sent: Saturday, July 14, 2001 9:19 AM
> > To: filmscanners@halftone.co.uk
> > Subject: Re: filmscanners: Grain, Noise, et al
> >
> >
> > Norman wrote:
> >
> > >>From a practical, rather than a causative approach, how have
> > folks dealt
> > >>with this issue, both in terms of minimizing apparent grain
> > from scans and
> > >>in improving (ie: reducing) the appearance of 'grain' in Photoshop?
> >
> > Norman, your defocussing scheme is undoubtably the fastest way to reduce
> > grain, although you pay a penalty (but surprisingly slight) in 
>sharpness.
> > Some of us (notably Maris) have found that separating the photo
> > into its RGB
> > components, blurring the Blue "mask", and then recombining them
> > eliminates
> > much of the grain with almost no obvious loss of detail. On
> > occassion, I've
> > had to blur *all three* components by varying amounts--which of course
> > brings it back around toward the original concept of defocusing,
> > with much
> > more time spent but slightly better control.
> >
> > With Picture Publisher 8 I've been able to isolate grain and/or
> > noise pixels
> > and change their color closer to what it's supposed to be, but have 
>never
> > been able to pull that trick off with Photoshop. Maybe someone else has
> > figured out how that's done in PS. ?
> >
> > Best regards--LRA
> >
> >
> >
> > >From: "Norman Unsworth" <unsworth_norman@aclink.org>
> > >Reply-To: filmscanners@halftone.co.uk
> > >To: <filmscanners@halftone.co.uk>
> > >Subject: filmscanners: Grain, Noise, et al
> > >Date: Fri, 13 Jul 2001 10:26:39 -0400
> > >
> > >I wanted to seek the input of list participants into the question of
> > >minimizing grain and noise in 35mm scans. While it varies according to
> > >subject matter, predominant color, film type and speed, all scans seem 
>to
> > >have some degree of grain / noise not found in the prints. I've used 
>both
> > >Vuescan's ability to manually focus (actually, slightly out of focus) 
>and
> > >grain reduction to reduce what I'm calling grain but obviously there 
>are
> > >drawbacks in the form of reduction of sharpness, in either of these
> > >solutions.
> > >
> > >By way of background, I use a Minolta Scan Dual II, with Vuescan and I
> > >always scan at the maximum resolution (2820, I believe), usually 48 
>bit.
> > >Color and film settings I vary depending upon what will get me the 
>'best'
> > >scan.
> > >
> > >From a practical, rather than a causative approach, how have folks 
>dealt
> > >with this issue, both in terms of minimizing apparent grain from
> > scans and
> > >in improving (ie: reducing) the appearance of 'grain' in Photoshop?
> > >
> > >Norm Unsworth, Owner
> > >Clark Systems Custom Golf: Outstanding Quality and Value in Custom Golf
> > >Equipment
> > >609 641 5712
> > >Please send email to me at: clarksystems@earthlink.net
> > >Visit our Web Site at http://home.earthlink.net/~clarksystems
> > >
> >
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn.com
> >
> >
> >
>

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