On Mon, Apr 11, 2011 at 02:19:16PM +0930, Peter Loveday wrote: > > 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?
Another point to take into consideration; you're ignoring noise. If you attempt to recover the "R" component from the three values you've recorded above, you've got the individual noise contribution from three different sensors to take into account. That's going to lower the signal-to-noise ratio considerably (by a factor of sqrt(3)) as compared to a direct single measurement from one sensor. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
