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If cx and cy aren't given, the default is to centre the rotation in the middle of the image. When cx and cy are given, the algorithm used is different, and does not change the size of the image.
imrotate(im, angle, cx, cy, interpolation = 1L, boundary = 0L)
an image
Rotation angle, in degrees.
Center of rotation along x (default, image centre)
Center of rotation along y (default, image centre)
Type of interpolation. One of 0=nearest,1=linear,2=cubic.
Boundary conditions. One of 0=dirichlet, 1=neumann, 2=periodic
imwarp, for flexible image warping, which includes rotations as a special case
cimg.limit.openmp() imrotate(boats,30) %>% plot #Shift centre to (20,20) imrotate(boats,30,cx=20,cy=20) %>% plot
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