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.

2 comments:

Dr Hurn said...

Dean,

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.