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.

 

[pmacias]

for your response.

Hi there,

Thank you for your question. The reason why blue and green color planes still exist in your photo even after using a red bandpass filter is due to the way colors are captured in photography.

When taking a photo, light is reflected off of the subject and enters the camera through the lens. The lens then focuses the light onto the camera's sensor, which is made up of millions of tiny pixels. Each pixel is sensitive to different wavelengths of light, and this is what enables the camera to capture different colors.

In the case of a red bandpass filter, only red light is allowed through and reaches the sensor. However, since the sensor is still sensitive to other colors, it can still capture and record the information for blue and green color planes.

Additionally, some cameras also have a built-in RGB filter, which helps to separate the different color planes and capture them separately. This is why even with a red bandpass filter, blue and green color planes can still exist in the photo.

I hope this helps to clarify any confusion. Let me know if you have any other questions.

Best,