Well, first, there is not a range for which I am “blind” to greens/reds, as in I would only see greyscale or something. Rather, there is a range of overlap for which both my green and red cones in my retina react to the light and so I essentially see both green and red, making the colors hard to distinguish. (Fun fact. As a result of this, I actually see slightly more blue that the average person.)
But when it comes to the green sequins, the tone/brightness of the light shouldn’t matter. It is the frequency of the light, not its relative intensity (above a certain level), that determines which cones are activated. So if they are all different shades of the same hue, they may fall into that overlap. But if it is partially reflecting other colors of light, then yes, the angle of the sequins may change how I am able to perceive the color(s) depending on those reflections.
Thank you so much!
A green sequin always reflects a specific frequency but maybe have different tones and intensity - I see this as a “different” colour, but really its green and it would always appear grey to you?
Whereas an iridescent one as a different example which has multiple different colours depending on the angle (red to purple, but that idea), you maybe able to see it reflecting purple but could also appear greyscale?
it would always appear grey to you?
Not at all. This is a common misconception about colorblindness because the name is kind of a misnomer for the majority of people who are colorblind. There are no colors that I am actually blind to, that I cant see or appear grey to me (except grey, of course). The only way you see some or all colors only in greyscale is by either having a defect in the visual processing of your brain or by missing one or more of the color sensing structures of the eyes. These structures are called cones. They come in red, green and blue varieties, and react to different ranges of light frequencies that causes us to see different colors.
My green cones still trigger for green frequencies for me exactly as yours would for you, so I do see colors, including green. But my colorblindness happens because there is a structural difference in my green cones that shifts the range of frequencies that trigger them towards the frequencies that trigger my red cones too. Because of this, there is a sizable range of color frequencies that trigger BOTH my green and red cones. Everyone has a little overlap, but mine is much larger than the normal overlap in non-colorblind people. When that happens, I still see colors. But instead of distinctly green or red colors, what I see is more muddled and brownish than what you would see. It’s because I’m basically getting mixed signals from my cones. There are also frequencies of light that are outside of this overlap that trigger only either my green or red cones, and so those colors do look distinctly and vibrantly green or red, even to me.
Again, thank you, I did misunderstand. This has been an immensely helpful discussion!
I had always thought, at least in my case, that my green and blue cones are normal, but my red just don’t work well. For example, if you just drop the R values in RGB in a picture to zero, I won’t generally notice. I would assume I’d perceive it somehow being different if my sensitivity shifted.
