GitLab

* * Corrected interpolate_bilinear for non-RGB images not to collapse into grayscale (#2089)

* * interpolate_bilinear uses now pixel_to_vector for shorter code.

* pixels now have operator!=.

* * Explicitely float interpolation

* Using C++11 static_assert() in interpolation.

* * Corrected documentation for interpolate_bilinear, interpolate_quadratic

* * Corrected formatting near interpolate_bilinear