Grayscale image: Difference between revisions

In order to allow proper overloading, the following subroutines of the [[Basic bitmap storage#Fortran|storage]] should be renamed appending the <tt>_rgb</tt> suffix: valid_image, inside_image, alloc_img, free_img, fill_img, get_pixel, put_pixel, init_img. The ''single channel'' version would be named with the <tt>_sc</tt> suffix, then we should define the proper interfaces to use the already written code as before. Here there are only the interfaces and subroutines needed for the task.