Obscura
As most of the pictures I take are Monochrome in JPEG, I configured the app to use a Monochrome Filter by default. Currently, my settings are:
Camera Device
Camera: Main Camera
Format Settings
Primary Format: None
Secondary Format: JPEG
Capture Settings
Flash: Off
Aspect Ratio: 3:2
Filter: M2
White Balance Mode: Auto
Display Settings
Grid: Thirds
Histogram: Off
Spirit Level: Spirit Level On