Timothy Hunter on wrote...
| I apologize up front if this post is vague. My last trig lessons were
| 35 years ago.
|
| I've been reading Anthony's examples on displacement maps.
|
| I'm working on an script that uses a displacement map to "bend" an
| image, that is, to make the left side of the image curve inward and
| the right side to curve outward, while leaving the top and bottom
| straight and parallel. If I use a displacement map with a gradient
| that changes linearly from black in the middle to gray50 on the top
| and bottom, the image sides become v-shaped, not curved. (I hope this
| is clear.)
|
| Instead of changing linearly, the intensities in the gradient must
| change on a curve, that curve being part of the perimeter of a circle
| having a specified radius. The radius of the circle defines how deep
| the curves on the sides are.
|
| I have code that produces the displacement map using some simple trig
| functions to compute each intensity, but it seems to me that this
| problem is probably already has a solution and I'm just ignorant of
| it. Is there a function in ImageMagick that will produce such a
| displacement map?
|
| If necessary I can produce the code (it's in Ruby) and the map I've
| got now.
Perhaps you can place some examples online, original, what you want,
what you get, how you generate the displacement map.
If you don't have a web site the IM site has a image gallery..
Hmmm strange, I can't seem to find a pointer to it.
Does anyone know where it is?
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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Did you ever have the feeling that the world was an AC coffee pot
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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