The Quattro Sensor and Luma

Started Jul 18, 2014 | Discussions thread
OP xpatUSA Forum Pro • Posts: 24,778
Off at a Tangent

xpatUSA wrote:

JimKasson wrote:

I scaled the Foveon responses so that their peaks were approximately unity.

The resultant fit is the dark blue curve below:

Y is CIE 1931 Y; Calc Y is the result of the weighted sum of the r, g, & b layers

My judgement, FWIW, based on the above is that, for the form Y=ax+by+cz, there are no possible weighting co-efficients that will sufficiently approximate a 'proper' luminance or luma curve from the raw channel values.

So, how Foveon or Sigma does it remains, for me, a matter of speculation

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