Kodachrome issues when using Digital ICE or Magic Touch Infrared ...

Kodachrome issues when using Digital ICE or Magic Touch
Infrared cleaning is a technique used by some film scanners and flatbed scanners to reduce or
remove the effect of dust and scratches upon the finished scan. It works by collecting an
additional infrared channel from the scan at the same position and resolution as the three visible
color channels (red, green, and blue). This infrared channel can be used to automatically
remove the appearance of dust and scratches in the visible channels and replace them
by inpainting.
Due to the nature of the dye and the Kodachrome film development process, Dust & Scratch
Removal Technology can misinterpret certain image detail as a defect. Certain images in which
the green and blue channels overshadow the red data may present a problem.
The Infrared dust removal process as in Digital ICE as well as Magic Touch is used to detect
scratches and dust during transparent film scan and is not applicable for opaque document
scanning. Where Chromogenic black-and-white films are supported by Digital ICE, other blackand-white
films containing metallic silver (which form from silver halides during the development
process of the film) are not. This is because the long wave infrared light passes through the
slide but not through dust particles. The silver particles reflect the infrared light in a similar
manner to dust particles, thus respond equally in visible light and infrared light. A similar
phenomenon also prevents Kodak Kodachrome slides from being scanned with Digital ICE
(Kodachrome's cyan layer absorbs infrared).
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Smearing will be visible on slides that have issues