I want to create a representation of the HSV cone similar to that at to show how it is
derived from the CIE 1931 chromaticity diagram . 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"

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I want to create a representation of the HSV cone similar to that at to show how it is
derived from the CIE 1931 chromaticity diagram . 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"

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microUgly:

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?

If it doesn't have to be vector then do it in GIMP. On your canvas, create a circle select and fill it with the "Full saturation sectrum" gradient using the shape, "conical (asym)". Then select a white to transparent gradient and fill the same circle with the "radial" shape selected. With the circle still selected, transform (or scale) it so it's an oval. Huzaah!

Well, I got my ellipse with rainbow perimeter converging to white at the centre just great!

I want this ellipse to be the flat top of an inverted cone, with the colours on the visible "side" of the cone converging to black at the point, similar to the HSV inverted cone in , but without all the
labels and arrows.

Extrapolating your directions for the ellipse above, I created a rainbow gradient from one side of the ellipse to the other just fine. I created a square that has the left edge green and transforms through a number of colours to purple on the right edge.

Then I tried to squeeze the black base of the square to a point halfway from left to right on the bottom edge using the Perspective (keystone) tool. After reading section 4.8, 'Perspective", I select the entire graphic, double-click the Perspective tool, set

@ Direction (.) Normal @ Interpolation: [Cubic ]
@ Clipping: [Crop to result ]
@ Preview: [Image + Grid ]
@ [ Number of grid lines ] [11]

Then I click on the graphic and move the bottom L handle to the middle of the bottom edge, and the bottom R handle also to the middle of the bottom edge so that there is a very short edge. The horizontal grid lines are parallel with the bottom edge. Then I click the Transform button and ... nothing happens.

So how to get the graphic to narrow from top to bottom?

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"

------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/