Answer: Most Colour Group meetings are free and open to all.
Occasionally you may need to register - check on our meetings page and
if it doesn't mention registration you can just turn up. You will be
very welcome.
Answer: Brown is "dark Yellow", so in isolation it looks yellow. For
anything to appear brown, it needs a
reference background of higher luminance.
These two words are displayed in exactly the same colour: it
is the background that makes the difference: brownyellow
Answer: You're both right: depending on which side of the
perception/physics fence
you're on!
In terms of Perception, Black like Greys and White, is an achromatic
colour: a colour without hue and saturation (or "strength").
If the term is intended to be Physical (physical and psychophysical
concepts are often confused) and Black refers to a total absence of
visible radiation (light) then, if there is no physical stimulus, there
can be no physiological response: no response-> no
perception-> no colour.
Answer: One data projector, one carousel projector, one overhead
projector, one whiteboard and one screen. Bring your own laptop if
required. If you need other facilities, please contact the organiser of
your meeting.
Answer: There are two sets of primary colours: red,green and blue are the additive
primaries used in colour vision, colour measurement, television sets
and computer monitors (because they correspond to the sensitive
elements in the human eye), but cyan,magenta and yellowsubtractive
primaries used in colour photography and printing. A cyan filter transmits green and
blue light (absorbing red), a magenta
filter transmits red and blue light (absorbing green) and
a yellow filter
transmits red and green light (absorbing blue). Perhaps this diagram
will make things clearer:
Sometimes people use the words blue,
red,yellow meaning what are here
defined as the subtractive primaries, but this leads to confusion.
email: The Colour Group of Great Britain - Homepage
Last Updated 13 November 2005
http://www.colour.org.uk/about.html
