OT: Re: Units??
gene.heskett at verizon.net
Sun Dec 3 15:17:52 UTC 2006
On Sunday 03 December 2006 05:25, Anne Wilson wrote:
>On Saturday 02 December 2006 23:32, Matthew Miller wrote:
>> On Sun, Dec 03, 2006 at 08:12:34AM +1100, Cameron Simpson wrote:
>> > On 02Dec2006 19:38, anne wilson <cannewilson at tiscali.co.uk> wrote:
>> > | I panicked when I got an unexpected screen, thinking that I had
>> > | actually accessed something else altogether. Naturally, then, I
>> > | didn't think of info, since it would tell me about the 'other' -
>> > | OK - it might have answered question 1. As it turns out, it
>> > | wouldn't have helped much, as it simply returns [... a useless
>> > | menu...]
>> > Info's usually annoying. Always start with "man units".
>> or use "pinfo" instead of regular info, unless you are an emacs
>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?
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
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