P3D No more two-color nonsense

["OLE HANSEN" <olejohan@xxxxxxxxxx>]

Tom Deering <tmd@xxxxxxxxxxx> wrote:
> ....the text repeatedly notes the tonal problems associated with
> duotones. Audiences of the time also saw the difference.....
It is not posibble to get a true color image with the technology of
today - what you get is an image resembling reality to some degree.
The 3 filter technique is more accurate than the 2 filter technique.
2 filter coloranaglyphs can get rather close to colorstereograms if
one avoids saturated red and blue colors. Halftoneanaglyphs are less
demanding, but should not contain pure white and/or black, as there
is no depth-information in white and black.

William J. Carter, Ph.D." <wc@xxxxxxxxxxxx> wrote:
> ....one filter subtracts a portion of the spectrum, and the
> other filter subtracts the rest.....
This is almost correct, but should have read:
"....one filter subtracts a portion of the spectrum, and the
other filter subtracts - A PORTION -  of the rest....."
As both filters have flaws and passbands with varying transmission
it is not possible to make a perfect colorphoto with red and cyan
filters. You can (with good filters) get quite close to the quality
of 3 filter colorphotos. An example can be seen at:

http://hjem.get2net.dk/stereoskopklubben/2color.htm

As for 3 filter coloranaglyphs there are different examples at:

http://hjem.get2net.dk/stereoskopklubben

regards
Ole Hansen - olejohan@xxxxxxxxxx


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