I got some basic knowledge about the blue/red filter on the above link.
I am confusing how a piece of red glass paper (red filter) can block the blue light, so that the blue channel can use for capture NIR? The red filter would not affect the green channel? If yes, what is the impact?
As I am trying to calculate the ENDVI , so I need to know how the filter affecting green channel. The equation from calculating the ENDVI shown as below:
ENDVI = [(NIR + Green) -- (2 * Blue)] / [(NIR + Green) + (2 * Blue)]