It could be because these other colors don't happen in nature, large difference between their surroundings. Green and blue seem to happen the most( sky, living plants) and the others only for a couple hours in a day. Brandon Irwin At 08:58 AM 3-14-2002, Pic Dude wrote: >If I remember correctly from my web graphics phase, RGB to greyscale >(intensity) conversion is 0.3R + 0.59G + 0.11B. Doesn't this suggest >that blue has the highest intensity, so it's scaled the least? And green >has >the lowest so it's scaled the most? > >If eyes are least sensitive to red, then I wonder why its used in most >alerting situations (brake lights, stop signs, etc).... hmmm? > > > >----- Original Message ----- >From: "Dave King" >To: >Sent: Thursday, March 14, 2002 2:22 AM >Subject: Re: [BUY]: LED sources... > > > > At 11:49 PM 3/13/02 -0800, you wrote: > > >At 11:06 PM 3-13-2002, Pic Dude wrote: > > >> > > Because your eyes are the least sensitive to red light > > >> > Peak response is at green (night vision viewers) and > > >> > yellow (warning signs / emergency vehicles) > > > > > >It makes you wonder what the world would look like if our eyes had a flat > > >response. I read somewhere that for red light to look the same amplitude, > > >it had to be same large number, like 1000, times brighter. This makes me > > >imagine how painful a sunset would be. :) > > > > > >Brandon Irwin > > > > If you look for the CIE charts and know what the wavelength is it's very > > easy to figure out > > the effective output of a color. For example a green might be .785 while > > the red is .48 > > and a blue .28. In other words if you had a 100 candela white, the red > > would appear to output > > 78% of that and so on. There are some colors that are under 1% effective. > > > > There are a couple of other standards but the CIE one has been around >since > > the mid 30's > > and is generally accepted by everyone. > > > > Dave > > > > -- > > http://www.piclist.com hint: The list server can filter out subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.