Kodak boosts digital camera sensitivity

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RGB from luminance, red and green

only works if you sample the same point or pixel with those three channels as you must subtract red and green from luminance to get to the blue. Sampling adjacent sites can be used to infer the blue channel but only by sacrificing resolution in blue. This may not make much difference as the human mind resolves detail mostly in the green cones in the fovea (where the are no or very few rods). These green cones give the peak of the photopic response and are also used to adjust accommodation or focus by the human vision system.

If you look at a CIE color diagram, note that the green and red regions span the entire "y" axis (CIE 1936 chart) and white is near the center. If you draw a line from red to green and then another line through white (say D65 white) that is perpendicular to the red green line, you will find the the line passes through the blue region (on the saturated color locus) at about 480 which is at the edge of cyan into going into blue. So deep blue tones (475nm and shorter) would be difficult to extract from your approach. In order to get the best color set representation, a deep blue cell would be needed. Most professional photographers would be disappointed with the color accuracy of a luminance, red, green sensor.

Posted by: jacarter3   Posted on: 06/14/07 You are currently: a Guest | Members login | Terms of Use

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