Spectral filtering of RGB components -

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Discussion Overview

The discussion revolves around the application of narrow-band notch filtering of RGB components from a white-light source and RGB displays. Participants explore the implications of this filtering on perceived color output, particularly whether it would result in greyscale, black, or white visuals.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires whether applying notch filters to RGB components from a white-light source would yield greyscale, black, or white output.
  • Another participant seeks clarification on the setup, specifically the type of detectors being used.
  • A participant clarifies that the detectors are human eyes and describes the envisioned application involving eyeglasses or goggles to filter visible light.
  • There is a question regarding the spectral width of the notch filters being used in the setup.
  • A participant confirms the use of notch filters with a proposed FWHM of around 20 nm, aiming to filter out RGB components from both white-light sources and RGB displays.
  • One participant speculates that applying the notch filters to RGB components may result in seeing complementary colors, while also questioning the visibility of light from RGB LEDs based on their spectral purity.
  • Another participant expresses interest in the application of notch filters for quality control of LED and CRT displays, while noting uncertainty about the spectral characteristics of pixel elements.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and agreement regarding the effects of the notch filters on color perception, with some proposing ideas and others questioning or seeking clarification. The discussion remains unresolved with multiple viewpoints presented.

Contextual Notes

Participants have not reached consensus on the outcomes of the filtering process, and there are uncertainties regarding the spectral characteristics of the light sources and the filters themselves.

rpswift
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My application involves narrow-band notch filtering of primary red, blue, and green wavelengths simultaneously from a white-light source. Will this yield greyscale output, black, or white? What if the light source is a RGB display? I understand that this may be a naive question - but it's outside my area and my E-M & Light course was long ago... Thanks!
 
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I don't understand your setup, exactly... for example, what's the detector(s)?
 
The detectors would be the eyes - sorry for the omission. This is still at the proof-of-concept stage, but we envision eyeglasses, goggles, or some other lense for this heads-up display. We want to filter the three primary colors (if possible) so that only the other visible regions can be "seen".
 
I'm still having trouble- you are using *notch* filters to selectively tune the output of a broadband source?

How wide (spectrally) are the filters?
 
Thanks, Andy, for your repsonse and apologies for my late reply.
Correct - notch filters with FWHM tbd - but say 20 nm or so; this is both to tune the broadband source (we don't care about any spectral frequencies outside the range of the human eye) and in a second application to filter RGB from common computer displays or LEDs. We are looking at unique/proprietary organometallic compounds with suitable optical properties.
So - if we apply the notch filter to RGB components of a white-light source, I expect that we'd see the range of complimentary colors? Similarly - it seems intuitive that the filter(s) to red, green, and blue LEDs, we would not see any visible light (depending upon the true spectral purity of the LED emissions?
One application may be in quality control of LED and CRT displays.
Thanks!
 
Interesting application...

If you applied the notch filters to a broadband source, I suspect it would still look white- the spectral response of your cones is quite broad.

I think using them as quality control elements for a tricolor display is a *very* intriguing idea. I don't know the spectral characteristics of the pixel elements, tho.
 

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