s/gimp_image_base_type/gimp_image_get_base_type/
s/gimp_image_width/gimp_image_get_width/
s/gimp_image_height/gimp_image_get_height/

Sorry plug-in developers, more porting work! But really this seems like
the right thing to do in order not to get stuck with inconsistent naming
for many more years to come.