I was reading NRK Beta earlier this week and an article mentioned that using a monochromatic colour space makes a device less attractive and should help decrease the usage of said device. Since I have already experienced monochrome earlier I decided to try out this experiment.

Changing colourspace in Settings

The easiest way to manually change the colourspace is to go through the settings application.

Developer Options

To change the colourspace in an Android device, the Developer Options needs to be enabled.

1. Open your Settings application.

2. Navigate to and open About phone or About tablet, usually at the very bottom in the System section.

3. Repeatedly tap Build number. After about 3 or 4 taps a notification will flash: You are now 4 steps from being a developer

4. Continue tapping Build number until a notification flashes: You are now a developer!

Summary

Settings → About phone → Build number (7 times)

Selecting colourspace

1. Open you Settings application.

2. Navigate to Developer options, usually second to bottom in the System section.

3. In the Hardware-accelerated rendering section, find Simulate colour space.

4. Select Monochromacy.

Re-enabling colour

1. Navigate to Simulate colour space.

2. Select Disable.

Summary

Settings → Developer options → Simulate colour space → Disabled or Monochromacy

Using command line

The change of colourspace can also be performed through command line. In my own tests, running this command via ADB does not require root, but Tasker does.

Selecting colourspace

Selecting monochromacy as colourspace

settings put secure accessibility_display_daltonizer 0

Enabling selected colourspace

settings put secure accessibility_display_daltonizer_enabled 1

Disabling selected colourspace

settings put secure accessibility_display_daltonizer_enabled 0

Source: Reddit