Exploding an image
schickb
During the "explosion" the central point wouldn't move and the further
a pixel was from the central point, the further is should move away
from that point during the explosion. Just like the movement of
particles in a real explosion that was perfectly uniform -- minus the
smoke and fire effects ;)
Does such a filter exist?
Ofnuts
The displacement map with a radial gradient as a map?
--
Bertrand
schickb
>> I'm looking for a way to explode an image around a central point.
>> During the "explosion" the central point wouldn't move and the further
>> a pixel was from the central point, the further is should move away
>> from that point during the explosion.
>
>
Sounds possible, but so far I haven't gotten that to do what I
described.
Ofnuts
Map layer: use radial with black at center. Make it "wide" (ie, end of
line near a corner).
When applying displace map: use polar mode, pinch only, with a fairly
high negative pinch (1/4 of you image width, for instance). I used -200
on a 800x600 image.
Potential improvements:
- if you apply your first map twice, you end up with a "squared" effect
which may be more dramatic. And even more so if you reapply the map
several times.
- Although it will be harder to generate(*), a star-shaped displacement
map may look more realistic.
- maybe your "explosion" requires more than a displacement.... You may
want to add some displacement jitter (use some random drawing as a
further displacement map) or add some noise to the original map.
Also, if you apply your first map twice, you end up with a "squared"
effect which may be more dramatic.
(*) maybe a plain B&W star with heavy-handed blur...
--
Bertrand
Michael Soibelman
Try spin-zoom or zoom-twist (I think that's what they're called) in the
Math<Map plugin. Get that here:
http://software.opensuse.org/search?p=1&q=mathmap&baseproject=ALL
Or maybe something similar in that (MathMap) plugin. I forget what else is
in there but I'm sure I've done what you are trying..