I think it's important to make it clear that, for many, digital noise isn't necessarily a problem. And in any case, it's certainly not exclusive to Pentax. At the very least it's no more of a problem than is grain in film photography. I think any vertical pattern here exists more in your mind than in the image. If one tries hard enough, one can find a pattern in almost any random array. It's like finding the cloud that looks like an elephant :-). Paul -------------- Original message ---------------------- From: "David Savage" <[EMAIL PROTECTED]> > Viewing at magnification doesn't highlight this problem, it masks it. > (If you sand with your nose up against a tree all you see is bark. > Step back a ways and you'll see the forest ;-) > > As I said it's not the worst example of the phenomenon, but I've > viewed this shot on 2 different monitors now & I can still see it. > > Anyway, enough of this dirge, back to photos & Pentax talk. > > Cheers, > > Dave > > On Nov 13, 2007 10:23 PM, Paul Stenquist <[EMAIL PROTECTED]> wrote: > > I find this interesting, because I've always wondered what people > > were referring to when they complained about vertical banding. I've > > posted 200% sections of the two black shirts. The exposure speed here > > is probably closer to ISO 1000, even though these were shot at ISO > > 500. To avoid losing highlights in the background I had to > > underexpose the foreground a bit and then brighten the shadows and > > midrange in conversion. I'm sure I pushed them up close to a full > > stop. With this extreme magnification I can see the colors that make > > up the black coming apart. I think it's a stretch to call it vertical > > banding. It's normal digital noise, what you'd get with almost any > > camera at this high an ISO. The only way I've ever been able to see > > something that actually looked like banding was shooting the inside > > of the lens cap and pushing it umpteen stops. Here are the clips: > > http://photo.net/photodb/photo?photo_id=6635580 > > http://photo.net/photodb/photo?photo_id=6635578 > > Paul > > > > On Nov 13, 2007, at 7:20 AM, David Savage wrote: > > > > > On Nov 13, 2007 8:55 PM, Paul Stenquist <[EMAIL PROTECTED]> > > > wrote: > > >> I don't see the vertical pattern noise. Where do you see it? I'll > > >> post an enlarged clip. I've examined the tiff at up to 200%. There's > > >> some conventional noise -- it's ISO 500 -- but nothing that appears > > >> to create a pattern of any sort. > > > > > > Odd. it's quite obvious to me in the dark shirts of the 2 nearest > > > ladies. > > > > > > It's not particularly strong, but the vertical banding is there. > > > > > > Cheers, > > > > > > Dave > > > > > > > > >>>> http://photo.net/photodb/photo?photo_id=6634039&size=lg > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions.
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