05-21-2011, 02:28 AM
[quote name='Lomskij' timestamp='1305936900' post='8710']
Actually all photosites provide luminance information, i.e. pure black and white pattern will look the same for R, G or B photosite. However, going back to old dispute with Brightcolours, there are situations where Foveon's approach does have an edge over Bayer's - namely where detail is created by the change in light intensity for specific wavelength only. For instance, red or blue flower petals, etc. The biggest nightmare for Bayer sensor would be black pattern on pure red background - G and B sensors would see it as black (red wavelength blocked) and effective resolution would be reduced by 4 <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='
' />
[/quote]
That could only happen if the CFA actually would just let through one wavelength, which is doesn't. Each "colour" lets through a wider band of the spectrum, making your example more or less purely theoretical...
Actually all photosites provide luminance information, i.e. pure black and white pattern will look the same for R, G or B photosite. However, going back to old dispute with Brightcolours, there are situations where Foveon's approach does have an edge over Bayer's - namely where detail is created by the change in light intensity for specific wavelength only. For instance, red or blue flower petals, etc. The biggest nightmare for Bayer sensor would be black pattern on pure red background - G and B sensors would see it as black (red wavelength blocked) and effective resolution would be reduced by 4 <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='
' />[/quote]
That could only happen if the CFA actually would just let through one wavelength, which is doesn't. Each "colour" lets through a wider band of the spectrum, making your example more or less purely theoretical...