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WCMY CCDs



 
 
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  #1  
Old October 11th 05, 08:07 PM
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Default WCMY CCDs

How come RGB CCDs are more common than WCMY CCDs? Looking over their
descriptions on the web, I would have thought WCMY CCDs would have made
RGB obsolete, not only for astronomy, but for consumer digital cameras
too. Resolution ought to be the same for both. WCMY gathers more
light. With four types of sensors, WCMY ought to give better color
balance too (after appropriate transformations).

  #4  
Old October 12th 05, 05:53 PM
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Color CCDs produce bad enough images when they use RGB Bayer filters.
They are even worse with CMY. Have a read:
http://www.sbig.com/sbwhtmls/cmynot.htm


A very good link, thank!

The first point (due to the required transformations you get a worse
signal-noise ratio per RGB pixel) looks correct, and gets even worse
for WCMY or CMYY.

The second (CMY, especially M, is blurred because R, G, B refract
differently) also looks correct and very bad.

The third (M=B+1.1R implies RGB colors are off) could be corrected by
testing the camera plus some linear algebra. RGB could have the same
problem (R might really be .9R), and could be fixed the same way.

 




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