In the last few weeks, histograms of certain scans made on my SS4000 are showing a very narrow spike (or sometimes 2 spikes) at the lower pixel levels, usually in blue and usually near level 0, level 1 or some level less than 9. The images I am scanning that display this spike are generally outdoor images with some burned out bright yellows flowers.
For example, on the slide I just scanned, Photoshop's histogram display shows this spike at level 1 where it reports about 520,000 count. That's nearly 3 times the count in the blue channel than at any other level in the histogram. I posted a screenshot of one of Photoshop's histogram here: http://www.tallgrassimages.com/test/histogram.jpg This histogram generated by VueScan and by Polaroid's own Polacolor Insight shows the same phenomenon. Sometimes when I try to see the count by Photoshop's histogram crosshair mouse cursor over the spike, the spike does not "register" on the count line--it's as though it isn't there. When I sample the pixels in the bright yellow areas, I don't see any pixels with a value above 250. I have Polacolor set for a white point of 255 for each of the color channels. I had thought these might be pixels that are beyond the white point, but the shape of the histograms doesn't look like that. The scans look OK on the screen. I don't see any anomalies. Stan Schwartz [EMAIL PROTECTED] ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
