polar coordinates query

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3 total messages Started by ken Tue, 27 May 2008 14:20

#108

Author: ken
Date: Tue, 27 May 2008 14:20

13 lines
1770 bytes

I've got a problem with the Polar Coordinates filter that probably
can't be fixed, but I thought I'd still ask...

I'm doing some graphics work that requires converting an image from
polar to rectangular, then back to polar again. It *should* go back to
the original image, but in practice, there's a bit of overlap,
resulting in a bit of the image being lost.

Does anyone know of a way to get round this? (I use PS6, BTW).

Thanks in advance

Ken

Re: polar coordinates query

#109

Author: hoffmann
Date: Tue, 27 May 2008 17:12

25 lines
2126 bytes


ken schrieb:
> I've got a problem with the Polar Coordinates filter that probably
> can't be fixed, but I thought I'd still ask...
>
> I'm doing some graphics work that requires converting an image from
> polar to rectangular, then back to polar again. It *should* go back to
> the original image, but in practice, there's a bit of overlap,
> resulting in a bit of the image being lost.
>
> Does anyone know of a way to get round this? (I use PS6, BTW).
>
> Thanks in advance
>
> Ken

Increasing the size of the canvas seems to help a little,
for instance by factor 1.5 in both directions.

I am familiar with coordinate systems, but I don't understand
the meaning of Photoshop's transforms. I had just tested
Cartesian --> Polar  followed by Polar --> Cartesian.

Best regards --Gernot Hoffmann

Re: polar coordinates query

#107

Author: Mike Russell
Date: Tue, 27 May 2008 17:56

5 lines
1655 bytes

Gernots suggestion of increasing the canvas size is good, plus you can do
an image resize to increase the number of pixels, to help retain the
original image.
-- 
Mike Russell - http://www.curvemeister.com

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