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Subject: Re: Using colour to indicate response intensity



Thanks to everyone for their replies. I'll check out the references suggested. FYI, the
application is the display of intensities read out of an instrument (e.g., corresponding
to the concentration of some element) and are displayed on a 2D graph (X = time, Y =
element mass). The intensity, or colour, is the third dimension, and we expect to see
islands of colour that change from the edge to the centre.

My first thought was to link the intensity directly to colour wavelength, so you'd get a
rainbow progression (in which, conveniently, the blue end means cool or low, and the red
end means hot or high). That seemed the most obvious, but I don't know the relationship
for it or if anyone else does that. A colleague has come up with a couple of possibilities
since I posted. One is to use the HSV circle with a section missing, but it produces too
much green for my liking, so we'd need to modify it. The other uses various sine and
cosine functions for R, G & B to produce a nice, smooth progression. It's pretty good but
a little weak in some colours.We'll keep experimenting.

David



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