Have a
look at ColorLUT from www.geovrml.com.
It'll build RGB gradients as you need, and store them.
If you
need more information about RGB/HSL spaces, reply privately.
Eric.
Hi, I'm writing a mapbasic program that gets a
"start colour" and and "end colour" from the user, then works out gradational
colours between those two - exactly the same as the range tool in
thematic mapping utility. (No I can't use that, so yes, I'm re-inventing
the wheel). So far I've got the code to work out the number of colour
variations required, and has worked out the numeric increment that is added to
the "start colour" RGB value to create a succession of new colours. It
works - i.e. I'm sort of seeing a colour variation, except that I'm getting a
variety of tones (i.e the brightness of the colours isn't gradational), which
doesn't look quite right. Anybody gone through this process
before? Or know of a decent resource that will explain the use of RGB
values? (I've read the MapBasic manual - Red x X, Green x Y etc),
but I haven't found that helpful.
TIA
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