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[filmscanners] SS4000 scans--strange pixel spike in histogram

  • To: lexa@www.lexa.ru
  • Subject: [filmscanners] SS4000 scans--strange pixel spike in histogram
  • From: "S Schwartz" <snsok@swbell.net>
  • Date: Sun, 09 Jun 2002 10:16:20 -0500
  • Importance: Normal
  • Unsubscribe: mailto:listserver@halftone.co.uk

I ran this question by last week and received one reply that wasn't the

Some of my recent scans done on an SS4000 are showing an odd spike in the
histograms. I first noticed this when I was doing Levels correction in
Photoshop. I checked the histograms in both Polacolor Insight and VueScan as
I did more scans and noticed the same thing.

Here is an example of what I mean:


These single level pixel spikes seem to be in the blue channel. I can't see
any streaking or lines or other anomalies on the scanned images themselves.
Sometimes there will be a very high pixel count in the spike as reported by
Photoshop. Sometimes the spike is visible but Photoshop doesn't register a
high pixel count at that particular level. These spikes seem to occur most
commonly at level 0 or level 1. They are not the same from slide to slide
and some slide scans don't produce such a spike.

Any ideas?

Stan Schwartz

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