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Re: filmscanners: Stellar ghosts and Nikon Coolscan IVED (LS40)
I am not sure if you picked up this post by Ed. I agree that it sounds
very like an exposure problem. As well as Ed's suggested Vuescan solution
you could try Nikonscan / Extras / Autoexposure / Lowcontrast low key (or
I hope you can sort this otherwise it seems to be a serious deficiency in
what one hopes is a great scanner.
At 19:56 10/05/01, you wrote:
>In a message dated 5/10/2001 3:20:02 AM EST, firstname.lastname@example.org writes:
> > When I scan an image containing black sky and bright stellar images with a
> > Nikon Coolscan IVED (=LS40) , then close to the edge of the field every
> > bright (saturated) stellar image has a faint ghost image separated from
> > the main image (by 20- 40 pixels). All the ghost images are on the
> > "outside". These are not present in the center 1/3 by 1/3 of the field.
> > Multiscanning with vuescan appears to make these features more striking
> > because it reduces the background noise but not
> > these images.
>The CCD might be over-exposed near the star, causing CCD
>charge bleeding. It might also be some kind of optical side effect.
>Try turning off "Device|Auto exposure" and set "RGB exposure" to 1.0.
in usually sunny, smog free Canberra, Australia