Archived posting to the Leica Users Group, 2001/05/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Mark Rabiner wrote: "In the 17.5 months I've used my LS-2000 Nikon scanner I've not once gotten ICE to work for me. The fact that I shoot 90% black and white 9% Kodachrome and 1% E6 might have something to do with that. ICE is supposed to recognize a separate layer on top of your emulsion where the dust is. Why the emulsion itself would not be made of silver but made of something else is a disappointment." Sorry about the disappointment. It is my understanding that Digital ICE works by "seeing" dust particles through a fourth channel of infrared light projected in a film scanner - the other three channels being RGB. The dye layers and film base in color or chromomeric film are invisible to the IR channel, so the IR channel "sees" only dust. Algorithms are used to paint the images in the places where dust appears. Silver grains in B&W film are opaque to the IR channel resulting in a block up of the highlight and midtone areas of B&W film with the IR scan. Digital ICE has worked fantastically on my color images. I wish it did work on B&W. Douglas F. Landrum Laguna Beach, California dflandrum@earthlink.net