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[filmscanners] Re: Another grain problem


  • To: lexa@www.lexa.ru
  • Subject: [filmscanners] Re: Another grain problem
  • From: "Johnny Zasada" <johnny_zasada@yahoo.com>
  • Date: Mon, 18 Feb 2002 23:20:20 +0100
  • Unsubscribe: mailto:listserver@halftone.co.uk


> I downloaded your images to look at in Photoshop.  There are a couple of
> possible reasons for what you are seeing, but they aren't grain, per say.
>
> The main problem seems to be in the green channel and to a lesser extent
> the blue.  It may be that the green channel of this scanner has poorer
> dynamic range and is unable to deal with the darker areas.  The blue
> channel is also a bit like this.

Thanks for your efforts. I only have PS 5 LE, so unfortunately I have no
access to the channels.

>
> It could also be the way you have adjusted the gamma and black and white
> points relative to the sensitivity curves of the CCD.

I tried to keep the scans as pure or raw as possible and set black to 0,
white to 255 and gamma to 1.0, doing the level/curves adjustments in PS.

> but more than likely you are hitting the limitation of the scanner to
> capture these darker ranges of colors, especially in the green channel.

Thats bad news ...

Johnny

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