Legacy ImageMagick Discussions Archive

I want to do the following distortion:



Is there a specific name for this?

Is there a built in tool to do it?

If I need to use -fx, could someone give me a hand with it?

Thanks all.

see barrel distortion http://www.imagemagick.org/Usage/distorts/#barrel

see Anthony's rose examples

you need to combine half of two images, top half of bulge (barrel) and bottom half of pinch (pincushion)

rose.jpg


convert rose.jpg -matte -virtual-pixel transparent \
-distort Barrel "0.0 0.0 0.0 1.0 0.0 0.0 0.5 0.5" \
barrel_bulge.png


convert rose.jpg -matte -virtual-pixel transparent \
-distort Barrel "0.0 0.0 0.0 1.0 0.0 0.0 -0.5 1.9" \
barrel_pinch.png



convert barrel_bulge.png[70x23+0+0] barrel_pinch.png[70x23+0+23] -append barrel_bulge_pinch.png



In one long command line it would be:

convert rose.jpg \
\( -clone 0 -matte -virtual-pixel transparent \
-distort Barrel "0.0 0.0 0.0 1.0 0.0 0.0 0.5 0.5" -crop 70x23+0+0 +repage \) \
\( -clone 0 -matte -virtual-pixel transparent \
-distort Barrel "0.0 0.0 0.0 1.0 0.0 0.0 -0.5 1.9" -crop 70x23+0+23 +repage \) \
-delete 0 -append barrel_bulge_pinch.png


see http://www.imagemagick.org/Usage/basics/#image_seq
for parenthesis and image sequence processing

Good reading at:

http://www.imagemagick.org/Usage/

and

http://www.imagemagick.org/script/comma ... ptions.php

Thanks for taking the time to answer my question. Unfortunately your suggestion gives



when what I'm looking for is



Is there something else to try?

Use the older -wave distortion.

http://www.imagemagick.org/Usage/distorts/#wave

this offsets each column of the image according to the sine-wave you specified. A half cycle sin wave looks exactly like what you want.