This is an old experiment, from the 19th century, I think. It works because the filters are not perfect, they let through some light that they are supposed not to. That´s why Maxwell succeeded. All the best! Raimo Personal photography homepage at http://www.uusikaupunki.fi/~raikorho
-----Alkuperäinen viesti----- Lähettäjä: Dr E D F Williams <[EMAIL PROTECTED]> Vastaanottaja: [EMAIL PROTECTED] <[EMAIL PROTECTED]> Päivä: 24. joulukuuta 2002 15:12 Aihe: The P30 and Land's experiment >Long ago, when he was working on the development of colour film, Land did an >interesting experiment. He took two pictures of the same scene with B&W >film, one through a green filter and one through red. The pictures were then >projected on a screen from two different projectors: one with a green filter >and one with a red filter over the lens. The result was a full colour image. > >In 1963 I found a description of this experiment in Scientific American and >did the experiment myself. Sure enough it worked. How and why? I don't >remember the details, or the explanation, but it had much to do with the >human eye and brain and less to do with the wavelength of the light >involved. I'm going to try the same experiment, but instead of projectors >I'm going to try to do something on my screen with Photoshop and layers. It >may not be possible, but will give me something to mess with between now and >when things get back to normal in a week or so. > >The most interesting thing about the whole experiment is that there were >shades of blue in the images. I'm going to pick up some B&W film for my P30, >before the shops shut, and have a go at this over the holidays. > >Don > >Dr E D F Williams > >
