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imagemagickimagemagick-convert

How to rotate image by 120 degree keeping its original shape

I have pattern image of 100x100 (vertical linings), i want to rotate it by 120deg. So i used following command.

  exec('convert -rotate "120" in.png out.png');

It rotates correctly, but i get white background on all for corners (a diamond pattern) because now pattern image is rotates.

enter image description here

But i want to get square 100x100 image with rotated pattern (120deg).

Solution

  • You don't have enough material to start with, so you kind of have to make some more by repeating what you have.

    So, if we start with this as stripes.png:

    enter image description here

    You can do this:

    convert stripes.png +clone +append +clone -append -rotate 120 -crop 100x100+70+70 result.png

    and get:

    enter image description here

    The sequence +clone +append duplicates the original image and appends the copy to the right, making it into a new, wider image. The sequence +clone -append duplicates the new, wider image and appends the clone underneath making a single, new taller image. The image is now twice as wide and twice as high as the original. I then rotate it, and crop out of the middle region.