I wonder how this works. Physically, that is. Image sensors in digicams have an RGB filter mask that works on a pixel-by-pixel basis. I find it hard to believe that the green pixels pick up green and IR light, unless the IR is several orders of magnitude brighter than visible light. It is more likely that only the red pixels pick up any IR, but then I would expect the unprocessed resulting images look black-and-red. But most pictures I've seen (e.g. here) look black-and-white with a red tint. How come? The only explanation I have is that the camera also picks up visible light, thus activating the green and blue pixels too, but the red ones are dominant because they pick up red and IR. In other words, if you replace an IR suppress filter with IR pass-though, you would get true black-and-red as I would expect. Am I on the right track?