181–190 of 218 posts
This article is false. Try this out Photoshop and not even close. Here are my results, with a 22px Gaussian Blur on the Channels https://imgur.com/a/AS0LAyk IMO The only reason the blue appears a little less blurry is that most of that color is in the water & clouds. Not in the land masses, with the sharp borders
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More, as in 10 times more for green, and 3 times more for red. So it's true that we're pretty blind to blue, just the "focusing" explanation is not correct...
Except that our perception of brightness, like loudness, is logarithmic, not linear. So even if blue is 1/10th or 1/3rd as strong as another color, it's not really a big deal in terms of sensitivity.
Instead it's like log(R/3 + G + B/10). So when G and B are about the same size, the effect of B will be negligible. It's only when R and G are small that the logarithm will kick in and let you see detail using the blue.
So for seeing detail in a normal picture, blurring the green will have a much larger effect than blurring the blue. But entirely removing the green would let it still look sharp, because we could see the detail using the red (or if we removed that, then blue). If we just blur the green it overwhelms the blue and red to make the picture look blurry even if the blue and red were enough to provide sharp detail if the green wasn't there.
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I'm not sure you're right. At night both I and my wife have reported difficulty reading glowing blue signs compared to glowing red/green signs at the same font size, brightness, and distance. I'm also not sure that the author is correct; the wrong-focal-distance explanation seems rather weak simply because our focal length is adjustable.
You have astigmatism. I have a similar issue with blue when not wearing my glasses. I have 20/20 vision, but my astigmatism makes it difficult to focus on certain things. A computer being a big one. Blue light blockers help, but with proper astigmatism correction I don’t need them.
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9 in 10 people have some affliction of astigmatism. Astigmatism is just that your eye isn’t perfectly spherical. What does your eye prescription say in the cyl and axis fields, that’s your astigmatism correction.
> About one in three people has some degree of astigmatism. https://my.clevelandclinic.org/health/diseases/8576-astigmat...
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You have astigmatism. I have a similar issue with blue when not wearing my glasses. I have 20/20 vision, but my astigmatism makes it difficult to focus on certain things. A computer being a big one. Blue light blockers help, but with proper astigmatism correction I don’t need them.
Astigmatism is easy to self-detect, and it's quite different from the light focusing to the wrong plane. Astigmatism will noticeably warp the entire shape of the distant point object, rather than just make it "fuzzy" in an isotropic manner.
Also note that blue neurons are also much less dense, and our eye blue channel has natively much lower resolution.
This is why in old Windows installers, blue color was used for gradient, when colors were 16 or 256 -- blue and black dots were blurred in the eyes, while the same combo of green dots was very visible.
A windows setup with blue background: https://guidebookgallery.org/pics/gui/installation/copying/w... (Don't have a green one, but one may try photoshopping this one.)
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I dunno, but when I look at glowing blue signs and blue Christmas lights at night, they look significantly more fuzzy than other color lights.
> At long last, we can see why the human eye can't focus on blue light At long last indeed. For decades I wondered why blue lights are disturbingly blurry at night, to the point I'd rather not look at them. I always thought it was just me since other people didn't seem to care as much.
While I like the colour combination, my next car had orange displays, which always look sharp.
Is this why I can't focus my eye on a blue LED while focusing on the surrounding area?
Could this be a factor in why we didn’t evolve to see a wider range of wavelengths? Is the visual spectrum just barely within the range that our brains can correct for the diverging focal lengths without needing additional lenses or modifications to the eye?
But blue comes mostly as diffused light from the sky. And the effect is especially pronounced in dusk, when blue color floods everything and reduces contrast. That's why yellow glasses help to increase it back and are used in sports and in driving.
