One of the best new techno tools available is the
Value Viewer app.
I previously posted about it here.
You can view your photos in grey scale, notan and levels,
and can adjust each one to get value pattern that you want.
Here is how one student used it for the
Vibrant Color exercise we did last week!
The opportunities with this are
Value Viewer didn't work well with the
I phone upgrade for a while,
but they have fixed it.
If you have an older version,
you should download the newer one.