Archived posting to the Leica Users Group, 2012/03/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Mar 21, 2012 at 10:58 AM -0700, Steve Barbour wrote: >Tim, maybe I'm confused, but if the human eye is more sensitive to >green, why more (rather than less) green pixels? Note, I've not really looked into this much. So I'm probably speaking out my butt a little bit. But, our eyes aren't making the image, a sensor is. So if you want to replicate what the eye would see, and the eye's sensitivity to luminosity, I would imagine you'd want your sensor to duplicate the spectral dependence of that sensitivity. Which means loading up on green pixels. The above is probably a gross over simplification. Our luminance resolution is much better than our color resolution. Our eyes have poor color resolution, particularly at the extremes of the colors we are sensitive to (red and blue). And green sensitivity kind of plays proxy for luminance sensitivity. Another factoid is that our eyes really aren't sensitive to RGB as we know it from computer imaging. Quoting from wiki: > For example, while the L cones have been referred to simply as red > receptors, microspectrophotometry has shown that their peak > sensitivity is in the greenish-yellow region of the spectrum. > Similarly, the S- and M-cones do not directly correspond to blue and > green, although they are often depicted as such. It is important to > note that the RGB color model is merely a convenient means for > representing color, and is not directly based on the types of cones in > the human eye. The fifth plot on this page shows relative brightness sensitivity of 'average' human vision (every person is different): http://en.wikipedia.org/wiki/Colour_vision There's also a bunch of interesting stuff on that and related pages. Ok, so I just looked at Bayer's original patent. Basically makes the above points, in a much more patentable manner :)