Re: [Inkscape-user] Multicoloured radial gradient -- how to?

[Hedley Finger <hfinger@xxxxxxxxxxxxxxxxxx>]

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 
<http://en.wikipedia.org/wiki/Image:HSV_cone.png>, 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" <hfinger@xxxxxxxxxxxxxxxxxx>



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