Colour planes still existing after filtering

[vipis]

Hey. I am wondering how can blue and green colour planes exist in a photo, when I am using red bandpass filter while taking photos? Red bandpass filter let's only red light through. But when i analyze the photo, green and blue planes are still there. How can it be?

Thanks in advance

 

[mfb]

What do you mean with "still there"?
Filters and color-sensitive detectors are not perfect (and they would not work as intended if they would be perfect) - even with a filter, you'll get non-zero green and blue values in a digital image.

 

[Andy Resnick]

Hey. I am wondering how can blue and green colour planes exist in a photo, when I am using red bandpass filter while taking photos? Red bandpass filter let's only red light through. But when i analyze the photo, green and blue planes are still there. How can it be?

Thanks in advance

If I understand your question, its because the light passing through the filter can still be (barely) detected by the green and blue sensor pixels- the Beyer filters are fairly broad, do you have any specs on your red filter?

 

[Claude Bile]

I agree with Andy - the blue and green sensors will still register a response when exposed to red light because the spectral response curve partially overlaps the red part of the visible spectrum.

Claude.