I do image rotation with cvWarpAffine() function.
All works ok, but I observed that interpolation is NOT working on image borders when filling outliers.
Is it the expected behavior or an ommision?
How can I get rotated images with borders (also) interpolated to fill color?
I attach here a croped sample to show how the image borders are not interpolated while internal pixels interpolation work ok.
I have solved my problen making the transparency mask with a black one-pixel border; then the borders are affected by interpolation and transparency on rotated pixels affect the displayed image softening the border.