Tuesday, May 03, 2005

IR bushes

Plus, a graph of the transmission of fully exposed and developed color negative film, from recorded by here:

This helps explain how dust removal scanners with ICE work--the film dyes are transparent in the infrared, but dust isn't. An infrared scan of the negative shows a clear negative with only the dust visible. Silver grains in black and white film are uniformly opaque to light and so ICE won't work with it.


Dr Hurn said...


Are you using a digital camera for these shots? Many modern cameras have sensors that work down into the IR range. I've tried shots with both the Nikon 990 and Nikon D100 and a dense Kodak IR filter and it works beautifully.

Dean W. Armstrong said...

I guess I never explained that! It's a Canon A95 digital camera.