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What is "Foveon Blue"?

Started May 26, 2014 | Discussions thread
xpatUSA
xpatUSA Forum Pro • Posts: 23,016
Re: What is "Foveon Blue"?

xpatUSA wrote:

My feeling is that if the WB were set for achromatic light, the lamp source color itself would be rendered correctly. The nearest WB on my cam to achromatic light (i.e. 5455K, vide illuminant 'E') is the 'sunlight' setting which is 5400K - and a small adjustment to the so-called tint (green/magenta) would bring the WB quite close to achromatic.

So I shot the sky (only) again today, using 'sunlight' WB. The cam was aimed up between my trees and the angle was about 45 degs from the sun. According to WikiPedia the sky should be pretty blue at that angle, although there was a light haze up there cutting back the saturation some.

Opened the image in SPP 3.5 with the histogram selected to 'All'. The blue was well over to the right as expected but the red and green were apart, with red quite a bit to the left of green. Then I got on the color circle adjustment thingy and increased in the magenta direction while watching until the red and green came together. It only took +4M to do that.

Not done yet. I don't know how 'pure blue' a sky should be and whether green or red should be significantly scattered compared to blue at that sun angle.

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Cheers,
Ted

 xpatUSA's gear list:xpatUSA's gear list
Panasonic Lumix DMC-LX1 Sigma SD9 Panasonic Lumix DC-G9 Panasonic Leica DG Macro-Elmarit 45mm F2.8 ASPH OIS Sigma 17-50mm F2.8 EX DC OS HSM +11 more
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