tag:blogger.com,1999:blog-11679575.post8938187186123189321..comments2023-12-23T03:18:42.423-05:00Comments on Gnomicon: Color TheoryScholeologisthttp://www.blogger.com/profile/01110359677410211160noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-11679575.post-71960333877074178162008-05-21T01:36:00.000-04:002008-05-21T01:36:00.000-04:00Word to the indirect night vision thing -- one of ...Word to the indirect night vision thing -- one of the trippier features of amateur astronomy is that you can see stuff by not looking at it, and when you try to look at it, it "disappears".<BR/><BR/>Between that and the general late-night disorientation, it's a pretty trippy "science". :)<BR/><BR/>So, I just looked up on <A HREF="http://en.wikipedia.org/wiki/Photoreceptor_cell" REL="nofollow">Wikipedia</A>, and it turns out that there is a <B>recently</B> discovered sort of photoreceptor, other than rods and cones. So there's one other type, which is apparently very exciting because no one's discovered much new in eyes in a long time.<BR/><BR/>(This is distinct for tetrachromatism, which some fish and possibly some women have. Do a wiki search on "tetrachromacy", but you'll just want to go read all the neat details under "color blindness". Have I mentioned wikipedia is awesome?)Scholeologisthttps://www.blogger.com/profile/01110359677410211160noreply@blogger.comtag:blogger.com,1999:blog-11679575.post-9318212794922617232008-05-20T16:55:00.000-04:002008-05-20T16:55:00.000-04:00I totally stated part of that backward... cones, c...I totally stated part of that backward... cones, crappy at night, rods, much better... but a lot of the photoreceptors in the fovea (our visual center of focus and best acuity) are cones... which means that seeing things at night may work better if you don't look *directly* at something.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11679575.post-13855402507254569282008-05-20T16:53:00.000-04:002008-05-20T16:53:00.000-04:00As far as I remember from Back in the Day, we have...As far as I remember from Back in the Day, we have a couple kinds of receptors... rods (black and white, great for contrast, crappy at night) and cones (color). The color processing we (people) do I think happens with two systems: red/green and blue/yellow. (So, most people who are colorblind are red/green colorblind, but still see blue and yellow hues.)<BR/><BR/>But I think you are right, Bob, Totally Awesome Gifting Brother, in that since these color cards are pigment based, rather than light-based, other animals may see them quite differently.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-11679575.post-76669314909619732612008-05-20T14:47:00.000-04:002008-05-20T14:47:00.000-04:00So I've got another question for ya. Computer gra...So I've got another question for ya. Computer graphics (and 4-color printing) are based on the idea that you can get any color by getting the right mix of three colors. That seems to me to kinda be a trick: Instead of giving off the wavelength of light you want, you're giving off three different wavelengths that just happen to excite the receptors of the eye the same way as the wavelength you're imitating. <BR/><BR/>Now if you've only got three kinds of receptors in your eye, is this trick really exactly as good as the real thing? Would bugs or something with different kinds of eye receptors think we were all colorblind and crazy?<BR/><BR/>(I might be making this up, but I think you have approximately _four_ kinds of receptors: cones of three different varieties for color, and rods that are black-and-white.)Scholeologisthttps://www.blogger.com/profile/01110359677410211160noreply@blogger.comtag:blogger.com,1999:blog-11679575.post-60728354963608894792008-05-20T12:35:00.000-04:002008-05-20T12:35:00.000-04:00I know nothing about color theory, so this may be ...I know nothing about color theory, so this may be a dumb question. Why is the completed color chart left with empty spaces? It seems like you could certainly have colors that continue on all the rows (except maybe the bottom, which looks pretty much like black). Do those colors show up on another chart? Do the charts fit together?Rebeccahttps://www.blogger.com/profile/05101977301861885022noreply@blogger.com