White point Black point...pointless?
Having a white point and black point, I have read, has been preached for some time. While there is no law, I still believe this is sound advice generally.
This image has an almost white point and an almost black point.
We can find the whitest point using Threshold.
And mark it using Color Sampler Tool.
Then, using Curves white eyedropper, convert it to white.
Finding the blackest spot is easy too.
Experimentation is in order but, in this photo, a small shift toward black adds contrast without sacrificing critical detail.
Of course, add some sharpening.
Crop and you are done.