When it comes to projection, you can increase brightness of the light source.
When it comes to optical printing, either to interneg or Ilfochrome, you can use masks to hold back the highlights, in order to dig out more detail from the shadows.
And when it comes to scanning and digital post-production, there are techniques available there as well.
You need to expose for the highlights, and use the after-exposure techniques to dig out more from the shadows. There is a lot of detail there, but it is hard to get at.