Kodak boosts digital camera sensitivity

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Yes, you repeated exactly what I said

"I can generate white from just and equal amount of two saturated colors, namely pure cyan light at 485-488 (argon ion laser) and pure yellow-orange light (filtered sodium lamp or dye laser). Both of these will not be completely detected using just red and blue filtered pixels."

"In your example with two monochromatic sources that appear white when combined, the blue channel will detect some of they cyan source and the red channel will detect some of the yellow-orange source. The result will be close to white if the system is well calibrated."

"Not be completely detected" provides for the fact that "the blue channel will detect some of they cyan source and the red channel will detect some of the yellow-orange source." You left out the important fact that the luminance channel (with no spectral filtering) would detect all of both.

And of course it will appear white; I chose these exact two wavelengths because they would, in the right radiometric (power) ratio appear to be white. But you ignore the pertinent fact - there is no green in this "white" polychromatic field. The Red/Blue/Luminance (RBL) approach would need to assign the color residual to a green channel while there is no green component.

More importantly, if the polychromatic field had a green component at say 510nm, this RBL approach would not be able to discriminate it from say 520nm with any confidence. I was not arguing that your example, that you now claim was examined by Kodak Research Labs, would not "work." I claimed that it would not work well enough for professional photography or cinematography where color accuracy is tantamount. I was trying to explain the reason why Kodak did not choose that approach.

But if it makes you feel better, you won the argument even though I never argued against it your position. Feel better?

Posted by: jacarter3   Posted on: 06/20/07 You are currently: a Guest | Members login | Terms of Use

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