Multicoloured radial gradient -- how to?

I want to create a representation of the HSV cone similar to that at 
<http://en.wikipedia.org/wiki/Image:HSV_cone.png> to show how it is 
derived from the CIE 1931 chromaticity diagram 
<http://en.wikipedia.org/wiki/Image:CIExy1931.svg>.  I want all the 
labels, arrows, and the wedge cut-out in this graphic -- which is 
unfortunately a PNG and not a vector graphic -- to be removed.

If have tried using the clone tool to obliterate the unwanted arrows and 
letters, but cannot get a clean blend, not even with a blurred brush 
tool.  One approach would be to treat a vector circle as the top of an 
apple pie, and create a series of wedges like slices.  Then, in each 
wedge (slice), create a gradient from the edge to the tip.  But I can't 
figure out how to  blend adjacent wedges.

Is there another approach to get a continuous rainbow of colours around 
the perimeter of the circle, and then do a radial blend from white in 
the centre to the perimeter?

I use The Gimp for pixmaps and Inkscape for vector graphics, and also 
Scribus.  If you don't have experience with these programs, can you 
describe what to do in general terms, not in specific PhotoShop, 
Illustrator, or InDesign terms.  It shouldn't be too hard to translate a 
general description into the necessary actions.

Regards,
Hedley

--

Hedley Finger

28 Regent Street   Camberwell VIC 3124   Australia
Tel. +61 3 9809 1229   Fax. (call phone first)
Mob. (cell) +61 412 461 558
Email. "Hedley Finger" <hfinger-6P+1Du0vV4/[email protected]>





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