I have been setting the white and black points in my photos using either the Histogram or Curves layers but noticed some (Photoshop) tutorials discussing using the Threshold Layer to do the same thing, but more objectively. Unfortunately the Photoshop tutorials do not seem to translate to AP as I can not find a Levels Tool (as compared to the Levels Layer) and the corresponding eyedroppers in AP. Given that I was wondering if anyone could point me to an AP tutorial on using the Threshold Layer as I have not been able to find one anywhere. A Google search for "Threshold tutorial, Affinity Photo" leads me to lots of AP tutorials, but none concerning use of the Threshold Layer.