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Polar Coordinates Micro-tut - Part 4
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| Spandex Rutabaga 2006-07-10, 7:43 pm |
| This micro-tutorial shows how deforming the image in some way
prior to applying the Polar Coordinate filter can change the
way the output looks.
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| Spandex Rutabaga 2006-07-13, 7:33 pm |
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Joske wrote:
>
> Spandex Rutabaga wrote:
>
>
> I'm slow catching up with this, I know. What I found fairly quickly,
> so I'll have at least one first comment: the second one from the top
> doesn't even seem to take half of an image.
>
> The outcome of a quarter top left is a perfect halfmoon. The outcome
> of the bottom right is an open half circle. Its bottom part is a
> little blurring, a mere contracted selection will solve this.
Remember, across the image is angle, so when I used half the
image, I rotated through half of 360 degrees. Up and down is
radius. If you have something only in the bottom of the image
the circle will have a central hole. Having something only at
the top means a circle that doesn't reach to the edges of the
image. When you use quadrants you exploit both the angle and
the radius effects. I guess I didn't make that as clear in
Part I as I had hoped.
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Spandex Rutabaga wrote:
> Joske wrote
[color=darkred]
[color=darkred]
[color=darkred]
[color=darkred]
> Remember, across the image is angle, so when I used half the
> image, I rotated through half of 360 degrees. Up and down is
> radius. If you have something only in the bottom of the image
> the circle will have a central hole. Having something only at
> the top means a circle that doesn't reach to the edges of the
> image. When you use quadrants you exploit both the angle and
> the radius effects. I guess I didn't make that as clear in
> Part I as I had hoped.
No no, this is not a shortcoming in all you offered. You offered a
whole lot and can't possibly be complete. In fact, I have had the
experience where I had so many examples on one of my pages that it
seemed to shy people away. Meaning they thought they couldn't do
more or better. Not good :-)
Actually, I liked the central hole shape. I get the reasoning, I may
be number blind but luckily was good in geometry in the two years we
still had it.
Joske
--
http://members.home.nl/j.a.c.backer/
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