That's not like any XYZ colour space transform I've ever seen?
It depends on the chromaticities of the source/target RGB space, but say for
sRGB to XYZ, one would use the matrix transform:
[ 0.4124564 0.3575761 0.1804375 ]
[ 0.2126729 0.7151522 0.0721750 ]
[ 0.0193339 0.1191920 0.9503041 ]
And the reverse, XYZ->sRGB:
[ 3.2404542 -1.5371385 -0.4985314 ]
[ -0.9692660 1.8760108 0.0415560 ]
[ 0.0556434 -0.2040259 1.0572252 ]
- Peter
-----Original Message-----
From: Sandy Harris
Sent: Monday, April 11, 2011 2:06 PM
To: Pentax-Discuss Mail List
Subject: A sensor question
The usual sensor uses basically three types of element -- R, G and B
-- in a particular layout.
Why not X Y Z where X = R+G, Y = R+G+B, Z = G+B ?
You can get RGB from XYZ easily enough:
Y-X = R+G+B - R+G = B
Y-Z = R+G+B - B+G = R
X+Z-Y = R+G + B+G - R+G+B = R
But the total light you are accepting is 2+2+3 = 7 rather than
1+1+1=3, so you are getting more photons overall. Isn't that
beneficial?
Y also gives you a straightforward monochrome.
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