问题
I am working on an iOS project which uses ImageMagick. I wonder if it is possible to perform some circular distortions on an image, but not on the center of the image, rather in a point (x,y) and of a given radius R.
Any (constructive) responses are well appreciated.
Many thanks
回答1:
If ImageMagick doesn't directly support doing a circular distortion at non-origin, you might want to pass in a sequence of commands to: a) add appropriate border to the image, b) do a circular distortion, c) get rid of the border added in (a). The size of the border is such that it effectively shifts the distortion origin to the desired place in the original image.
来源：https://stackoverflow.com/questions/8172512/imagemagick-circular-dstortion-on-ios