Image distortion, specified by a formula, is there a plugin? [SEC=UNCLASSIFIED]

[Goldsmith, Noel]

Hi,
I have spent some time searching for an anamorphic plug-in which allows the
user to distort an image in a particular way. By anamorphic I mean the
plug-in produces distortion in one direction but not at right angles. A
simple distortion is to expand the image by scaling one direction only. I
want to change the rate of this scaling according to some simple function/s
as a function of the position.

The distortion I require is one which magnifies the image along the X (or Y)
direction with a user defined function.

So if there are any plug-ins or plug-in which may be modified out there
which already do it and I missed on seeing it  I would appreciate learning
of this. And if anyone is willing to offer advice about starting such a
plug-in I would be grateful.
Thank you
Noel.
Noel Goldsmith
Air Vehicles Division
DSTO
506 Lorimer Street
Port Melbourne
3207 Victoria
AUSTRALIA
613 96267527
0428364003
[hidden email]
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[Rasband, Wayne (NIH/NIMH) [E]]

On Sep 12, 2012, at 8:32 PM, Goldsmith, Noel wrote:

> Hi,
> I have spent some time searching for an anamorphic plug-in which allows the
> user to distort an image in a particular way. By anamorphic I mean the
> plug-in produces distortion in one direction but not at right angles. A
> simple distortion is to expand the image by scaling one direction only. I
> want to change the rate of this scaling according to some simple function/s
> as a function of the position.
>
> The distortion I require is one which magnifies the image along the X (or Y)
> direction with a user defined function.
>
> So if there are any plug-ins or plug-in which may be modified out there
> which already do it and I missed on seeing it  I would appreciate learning
> of this. And if anyone is willing to offer advice about starting such a
> plug-in I would be grateful.

You can easily do this using the Process>Math>Macro command. For example, enter "v=getPixel(x/2,y)" to magnify the image by 2 in the x direction.

-wayne

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