theSuede wrote:
And then, as per request, the scatterplot of the (Green1-Green2) vs Red/GreenAverage saturation following Emils suggestion of a simple
[ (Gr1-Gr2)/GrAverage vs (Gi-R)*(Gi+R) ] to get the correlation between Red channel saturation compared to average green and green channel difference signal.
Same for blue channel saturation.
There\'s a strong correlation, the only thing messing things up is the fact that the red channel swings back in efficiency as you get colser to the other end of the spectrum, near blue-violet. Therefore, the blue channel (which is a single peak, no swingbacks or plateaus) shows a much stronger correlation. In fact, a VERY strong correlation.
So, there\'s very strong evidence that:
1) the two green channels are not the same efficiency (one has a \"diluted\" colour filter) and:
2) one green channel is significantly more yellow than the other.
Not of interest to most people I guess, but some of us really want to know the \"why\" in some of these things...
Could it simply be that the sample you tested had the CFA misaligned with the pixel array, so that in one column the nominal G photosite was beneath a mix of the R and G filters, and in the next column the G photosite was beneath a mix of the B and G filters?
Oct 12, 2009 at 12:17 AM
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