How do our colour-blind cones achieve colour vision?
theneurosphere.com
How do our colour-blind cones achieve colour vision?
1–10 of 16 posts
Re: How do our colour-blind cones achieve colour vision?
#2I'm always surprised to see barely high-school level science articles get on the front page.
An alternative title to this article could be "how spaceless numbers achieve defining space"? Like you just have a basis, and this defines space. Mind blown. Really, how do these magnets work?
Re: How do our colour-blind cones achieve colour vision?
#3> A printer generates all the colours we see just by blending three coloured inks in varying quantities
I thought printers typically use CMYK (4 inks) or CMYKOG (6 inks).
Re: How do our colour-blind cones achieve colour vision?
#4> A printer generates all the colours we see just by blending three coloured inks in varying quantities I thought printers typically use CMYK (4 inks) or CMYKOG (6 inks).
Correct. Or more.
OP is incorrect; no tristimulus based (RGB or CMY) combination can reproduce the spectral locus without resorting to imaginary colour primaries. Imaginary primaries cannot be reproduced in reality, and as such, “all the colours we see” is “all the colours we may see from the printer.”
Re: How do our colour-blind cones achieve colour vision?
#5I'm always surprised to see barely high-school level science articles get on the front page. An alternative title to this article could be "how spaceless numbers achieve defining space"? Like you just have a basis, and this defines space. Mind blown. Really, how do these magnets work?
It's not even an article I'd want to present to a high school class. An RGB pixel on your monitor is not emitting red, green and blue monochromatic (single wavelength) light. Same goes for the light reflected from a CYM pigment. Metamerism is at play, just like in the "real world". The author confuses the need to choose three primaries with a requirement those primaries be monochromatic. And since when have painters stuck to three pigments?
Re: How do our colour-blind cones achieve colour vision?
#6I'm always surprised to see barely high-school level science articles get on the front page. An alternative title to this article could be "how spaceless numbers achieve defining space"? Like you just have a basis, and this defines space. Mind blown. Really, how do these magnets work?
Not every school teaches this well, or at all. Not all people currently interested in this were listening to school lessons N years ago. Approachable explanations of everyday natural phenomena seem to be appropriate here to avoid narrowing your reading to startups and web tech.
Re: How do our colour-blind cones achieve colour vision?
#7I'm always surprised to see barely high-school level science articles get on the front page. An alternative title to this article could be "how spaceless numbers achieve defining space"? Like you just have a basis, and this defines space. Mind blown. Really, how do these magnets work?
Right, but color (hue) shouldn't require a three-dimensional basis; it is just the frequency domain.
If each of the values of a three-dimensional coordinate pair encoded frequency, that triplet could carry information about a mixture of up to three colors. This would require sensors that are not "color blind".
I think that's a good summary of the article's point.
Re: How do our colour-blind cones achieve colour vision?
#8I'm always surprised to see barely high-school level science articles get on the front page. An alternative title to this article could be "how spaceless numbers achieve defining space"? Like you just have a basis, and this defines space. Mind blown. Really, how do these magnets work?
Not every school teaches this well, or at all. Not all people currently interested in this were listening to school lessons N years ago. Approachable explanations of everyday natural phenomena seem to be appropriate here to avoid narrowing your reading to startups and web tech.
>to avoid narrowing your reading to startups and web tech.
Where did I try to make this point? My issue is with the quality, not the subject. As pluteoid remarked, this is not a very good article, and fairly long-winded with regard to its content.
There has been many submissions of articles regarding color theory and its relation to psychology, design and physics, many of which are very interesting, and make you learn useful and applicable knowledge. For instance, you may learn how to write an imagemagick script to get the dichromat version of an image.
Re: How do our colour-blind cones achieve colour vision?
#9I enjoyed reading this article and found it interesting, even if I was re-learning some of the stuff mentioned.
If the errors pointed out by above posters are valid, they should really go over to the OP's blog and post them so she can correct the post.
Re: How do our colour-blind cones achieve colour vision?
#10As a former neuroscientist who studied perceptual awareness, there's lots of little things wrong with this article.
1) The RGB palette used in monitors most certainly does not span the whole gamut of human vision. Not even the wide-gamut monitors used professionally can do that yet.
2) The diagram showing each cone type's peak spectral sensitivity is a bit misleading, too. The M- and L-cones are colored red and green, but if you notice carefully, their peaks lie in the green/yellow area, so characterizing them as red/green is misleading. And "each of our cones seeing a primary colour (blue, green, or red)" is flat-out wrong. Every cone fires in proportion to its overlap. The author clarifies this later, but it's best to tell people the caveats up front. Continually referring to "primary" colors is adding to the confusion here.
3) WhIle they did cite an article pointing out that ratio-computing cells exist in the retina, it does NOT follow that "it is the main source of information that the brain has to help it identify the wavelengths of light". The paper itself only talks about spectral separation in retinal cells pre-brain. I don't know where the author got the idea that ratios are the main source of info sent to the brain. Amplitude information is sent, as well.