[magick-users] displacement map question

[Timothy Hunter]

On Sep 14, 2006, at 10:13 PM, Anthony Thyssen wrote:

> Timothy Hunter on  wrote...
> | > Perhaps you can place some examples online, original, what you  
> want,
> | > what you get, how you generate the displacement map.
> | >
> |
> | After rather more messing about with my ISP than should be necessary
> | (and scrounging a picture of a right triangle from the web), I've
> | managed to upload a web page with the images, Ruby program, and some
> | explanation. Check out http://home.nc.rr.com/foxhunter/ 
> polaroid.html.
> |
> | The short version of my question is: is there a better, simpler way
> | of producing the result of the displace operation?
>
> YES!!!
>
> As all you are doing is a slight bend in the picture. then
> you can just use -wave.
>
> However -wave only works in the displacement in the Y direction.
> And in your case can add lots of extra space.
>
> To fix, rotate your picture 90 degrees (no loss of quality)
> run it through wave (some quality loss, to be expected)
> crop the unwanted space, and rotate back (or visa-versa).
>
Thanks, Anthony. I thought about wave but I was afraid that the two  
rotations would cause me to end up with a bad-looking image. I'm glad  
to hear that it won't.