On Sunday 03 December 2006 10:17, Gene Heskett wrote: > On Sunday 03 December 2006 05:25, Anne Wilson wrote: >>> snip > >Which brings me to a related problem. When getting a colour listing > > in a terminal I find the blue on black almost impossible to read. > > I'm sure there must be a way to lighten the blue, but my poking > > around so far hasn't found it. Any ideas? > > > >Anne > > Basicly, that's a human eye problem, Anne. Blue is only 11% as > bright for the same energy in as white. Green is 59%, and red as we > get it out of crt phosphers is not only shifted toward the orange to > make it brighter but is still only in the 30's someplace then. For > those with some color blindness, blue is often very poorly seen. > Even for those with excellent color vision like me, its still a poor > choice in terms of readability. > > Interestingly there was an article in one of the sci journals about a > year ago that discussed bird vision, and it conjectured that at one > point, their dinosaur inherited eyes were much wider bandwidth than > our eyes today, with an additional 4th sensitivity peak reaching well > into the ultraviolet, effectively giving them 4 color vision. This > is still true of the birds considered more primitive today in fact. > These same birds have dyes in their feather coloration that make them > highly visible to a potential mate whose 4 color vision can see them > quite well, but much less so for the average predators more limited > eyes, many of whom we mistakenly assume to be color blind. They are > not, anymore than our color-blind people are as they, like us do see > two colors, a dim blue bandwidth and the much more visible > green-orange peak. It was a very interesting read. > So what we need is a literate parrot, preferably with a USB 2.0 port. Off to google... -- cmg
